Thin Lenses

Types of Lenses and Effects on Light

By the end of the lesson, the learner should be able to:
Define a lens and distinguish between convex and concave lenses; Describe the effect of lenses on parallel rays of light; Explain convergence and divergence of light rays; Identify practical examples of different lens types

Q/A on refraction concepts; Experiment 1.1 - investigating effects of lenses on parallel rays using sunlight and ray box; Demonstration of convergence and divergence; Group identification of lens types in everyday objects; Drawing and analysis of ray diagrams

Ray box; Various convex and concave lenses; White screen; Plane mirror; Card with parallel slits; Sunlight or strong lamp

KLB Secondary Physics Form 4, Pages 1-6

Thin Lenses

Definition of Terms and Ray Diagrams
Image Formation by Converging Lenses
Image Formation by Diverging Lenses and Linear Magnification
The Lens Formula
Determination of Focal Length I
Determination of Focal Length II

By the end of the lesson, the learner should be able to:
Define centre of curvature, principal axis, optical centre, principal focus and focal length; Distinguish between real and virtual focus; State and apply the three important rays for lens diagrams; Construct basic ray diagrams for lenses
Derive the lens formula using similar triangles; Understand and apply the Real-is-positive sign convention; Use the lens formula to solve problems involving object distance, image distance and focal length; Solve Examples 4, 5, 6, and 7 from textbook

Q/A review of lens effects; Guided discovery of lens terminology using practical demonstrations; Step-by-step construction of ray diagrams using the three important rays; Practice drawing ray paths for parallel rays, rays through focus, and rays through optical centre; Group work on ray diagram construction
Review of magnification concepts; Mathematical derivation of lens formula from similar triangles; Introduction to sign convention rules; Step-by-step solution of Examples 4-7; Practice problems applying lens formula to various situations; Group work on formula applications

Various lenses; Rulers; Graph paper; Ray boxes; Charts showing lens terminology; Drawing materials; Laser pointers (if available)
Converging lenses; Objects; White screen; Metre rule; Candle; Graph paper; Charts showing applications; Camera (if available)
Diverging lenses; Graph paper; Rulers; Calculators; Examples from textbook; Objects of known heights; Measuring equipment
Mathematical instruments; Charts showing derivation; Calculators; Worked examples; Sign convention chart; Practice worksheets
Converging lenses; Lens holders; Metre rule; White screen; Distant objects; Plane mirror; Pins; Cork; Glass rod; Light source; Cardboard with cross-wires
Experimental setup materials; Graph paper; Calculators; Data tables; Examples 8-10 from textbook; Materials for displacement method

KLB Secondary Physics Form 4, Pages 3-8
KLB Secondary Physics Form 4, Pages 14-20

Thin Lenses

Power of Lens and Simple Microscope
Compound Microscope

By the end of the lesson, the learner should be able to:
Define power of a lens and calculate using P = 1/f; Use dioptre as unit and distinguish positive/negative power; Explain working of simple microscope (magnifying glass); Understand why short focal length lenses are preferred; Calculate magnification of simple microscope

Q/A on focal length concepts; Introduction to lens power with practical examples; Power calculations and comparisons; Demonstration of simple microscope setup; Analysis of magnification factors; Discussion of applications and limitations of magnifying glass

Various lenses of different focal lengths; Magnifying glasses; Small objects; Calculators; Power calculation charts; Small print materials; Biological specimens
Compound microscope; Charts showing microscope structure; Lenses representing objective and eyepiece; Calculators; Example 11 from textbook; Ray tracing materials

KLB Secondary Physics Form 4, Pages 26-28

Thin Lenses

The Human Eye

By the end of the lesson, the learner should be able to:
Describe structure of human eye and functions of each part; Explain accommodation process and role of ciliary muscles; Define near point and far point; Understand how eye focuses at different distances; Compare eye structure with camera

Introduction to human eye as natural optical instrument; Detailed study of eye structure using charts/models; Demonstration of accommodation using flexible lens model; Practical measurement of near and far points; Comparison table of eye vs camera similarities and differences

Charts/models of human eye; Torch for demonstrations; Eye model with flexible lens; Objects at various distances; Measuring equipment; Camera comparison charts

KLB Secondary Physics Form 4, Pages 30-32

Thin Lenses

Defects of Vision
The Camera and Applications Review

By the end of the lesson, the learner should be able to:
Describe short sight (myopia) and its causes; Explain correction of myopia using diverging lenses; Describe long sight (hypermetropia) and its causes; Explain correction of hypermetropia using converging lenses; Draw ray diagrams showing defects and their corrections

Q/A on normal vision and accommodation; Analysis of myopia - causes, effects, and correction; Ray diagrams for uncorrected and corrected myopia; Study of hypermetropia - causes, effects, and correction; Ray diagrams for uncorrected and corrected hypermetropia; Demonstration using appropriate lenses

Charts showing vision defects; Converging and diverging lenses; Eye models; Spectacles with different lenses; Vision test materials; Ray diagram materials
Camera (if available); Charts showing camera structure; Comparison tables; Review charts of all applications; Summary materials; Demonstration equipment

KLB Secondary Physics Form 4, Pages 32-33

Uniform Circular Motion

Introduction and Angular Displacement
Angular Velocity and Linear Velocity
Centripetal Acceleration

By the end of the lesson, the learner should be able to:
Define uniform circular motion and give examples; Define angular displacement and its unit (radian); Convert between degrees and radians; Derive the relationship s = rθ; Solve Example 1 from textbook
Define angular velocity (ω) and its units; Derive the relationship v = rω; Calculate period (T) and frequency (f) of circular motion; Solve Examples 2(a) and 2(b) from textbook; Relate linear and angular quantities

Q/A on linear motion concepts; Introduction to circular motion using real-life examples (merry-go-round, wheels, planets); Definition and demonstration of angular displacement; Mathematical relationship between arc length, radius and angle; Practical measurement of angles in radians; Solution of Example 1
Review of angular displacement through Q/A; Introduction to angular velocity concept; Mathematical derivation of v = rω relationship; Exploration of period and frequency relationships; Step-by-step solution of Examples 2(a) and 2(b); Practical demonstration using rotating objects; Group calculations involving different circular motions

Merry-go-round model or pictures; String and objects for circular motion; Protractors; Calculators; Charts showing degree-radian conversion; Measuring wheels
Stopwatch; Rotating objects (turntables, wheels); String and masses; Calculators; Formula charts; Examples from textbook; Measuring equipment
Vector diagrams; Rotating objects; Calculators; Charts showing acceleration derivation; Example 3 materials; Demonstration of circular motion with varying speeds

KLB Secondary Physics Form 4, Pages 37-39
KLB Secondary Physics Form 4, Pages 38-40

Uniform Circular Motion

Centripetal Force and Factors Affecting It

By the end of the lesson, the learner should be able to:
Explain the need for centripetal force in circular motion; State factors affecting centripetal force (mass, speed, radius); Derive centripetal force formula F = mv²/r = mrω²; Perform Experiment 2.1 investigating F vs ω²; Solve Example 4 from textbook

Review of Newton's laws and centripetal acceleration; Introduction to centripetal force concept; Experimental investigation of factors affecting centripetal force; Performance of Experiment 2.1 - relationship between F and ω²; Data collection and analysis; Solution of Example 4; Discussion of practical implications

Metal pegs; Turntable and motor; Variable resistor; Dry cell; Metal ball and string; Spring balance; Clock; Graph paper; Calculators

KLB Secondary Physics Form 4, Pages 42-47

Uniform Circular Motion

Experimental Investigation of Centripetal Force
Case Examples - Cars and Banking

By the end of the lesson, the learner should be able to:
Perform Experiment 2.2 investigating speed vs radius relationship; Plot graphs of F vs ω² and v² vs r; Analyze experimental results and draw conclusions; Understand the relationship F ∝ mv²/r; Apply experimental findings to solve problems

Q/A on previous experiment results; Setup and performance of Experiment 2.2 - variation of speed with radius; Data collection for different radii; Graph plotting and analysis; Verification of theoretical relationships; Group analysis of experimental errors and improvements; Application of results to problem solving

Same apparatus as Experiment 2.1; Graph paper; Additional measuring equipment; Data recording tables; Calculators; Analysis worksheets
Model cars and tracks; Inclined plane demonstrations; Charts showing banking principles; Calculators; Friction demonstration materials; Pictures of banked roads and aircraft

KLB Secondary Physics Form 4, Pages 44-47

Uniform Circular Motion

Case Examples - Cyclists and Conical Pendulum

By the end of the lesson, the learner should be able to:
Analyze forces on cyclists moving in circular tracks; Explain cyclist leaning and conditions for no skidding; Describe conical pendulum motion; Derive equations for conical pendulum; Solve Example 5 from textbook

Q/A on banking concepts; Analysis of cyclist motion on circular tracks; Force analysis and conditions for stability; Introduction to conical pendulum; Mathematical analysis of pendulum motion; Step-by-step solution of Example 5; Practical demonstration of conical pendulum

Model cyclists; Pendulum apparatus; String and masses; Force diagrams; Calculators; Example 5 materials; Protractors for angle measurement

KLB Secondary Physics Form 4, Pages 50-52

Uniform Circular Motion
Uniform Circular Motion
Floating and Sinking

Motion in Vertical Circle
Applications - Centrifuges and Satellites
Introduction and Cause of Upthrust

By the end of the lesson, the learner should be able to:
Analyze forces in vertical circular motion; Understand variation of tension at different positions; Derive expressions for tension at top and bottom positions; Calculate minimum speed for vertical circular motion; Apply concepts to practical examples (bucket of water, loop-the-loop)
Explain working principles of centrifuges; Describe separation of particles using centripetal force; Understand satellite motion and gravitational force; Apply Newton's law of gravitation to satellite orbits; Explain parking orbits and their applications

Review of circular motion in horizontal plane; Introduction to vertical circular motion; Force analysis at different positions in vertical circle; Mathematical derivation of tension variations; Discussion of minimum speed requirements; Practical examples and safety considerations; Problem-solving involving vertical motion
Q/A on centripetal force applications; Detailed study of centrifuge operation; Analysis of particle separation mechanisms; Introduction to satellite motion; Application of universal gravitation law; Discussion of geostationary satellites; Analysis of satellite velocities and orbital periods

String and masses for vertical motion; Bucket and water (demonstration); Model loop-the-loop track; Force analysis charts; Safety equipment; Calculators
Centrifuge model or pictures; Separation demonstration materials; Satellite orbit charts; Calculators; Newton's gravitation materials; Model solar system
Spring balance; Objects (stones); String; Eureka can; Beaker; Water; Measuring cylinder; Beam balance; Dense objects; Charts showing pressure variation

KLB Secondary Physics Form 4, Pages 52-54
KLB Secondary Physics Form 4, Pages 54-55

Floating and Sinking

Upthrust in Gases and Archimedes' Principle

By the end of the lesson, the learner should be able to:
Explain upthrust in gases with examples; State Archimedes' principle clearly; Apply Archimedes' principle to solve problems; Solve Examples 1, 2, and 3 from textbook; Calculate apparent weight and upthrust in different fluids

Review of upthrust in liquids through Q/A; Discussion of upthrust in gases using balloon examples; Statement and explanation of Archimedes' principle; Step-by-step solution of Examples 1-3; Problem-solving involving apparent weight calculations; Group work on upthrust calculations

Balloons; Helium or hydrogen (if available); Objects of known density; Calculators; Examples from textbook; Different liquids for demonstration; Measuring equipment

KLB Secondary Physics Form 4, Pages 60-66

Floating and Sinking

Law of Flotation and Applications
Relative Density Determination

By the end of the lesson, the learner should be able to:
Perform Experiment 3.2 investigating upthrust on floating objects; State the law of flotation; Explain the relationship between weight of object and weight of displaced fluid; Solve Examples 4, 5, 6, and 7 involving floating objects; Apply law of flotation to balloons and ships

Q/A on Archimedes' principle; Performance of Experiment 3.2 - investigating floating objects; Analysis of experimental observations; Statement of law of flotation; Step-by-step solution of Examples 4-7; Discussion of applications in balloons, ships, and everyday objects

Test tubes; Sand; Measuring cylinder; Water; Balance; Floating objects; Examples from textbook; Calculators; Model boats; Balloon demonstrations
Spring balance; Various solid objects; Different liquids; Measuring cylinders; Calculators; Examples from textbook; Objects of unknown density; Data recording sheets

KLB Secondary Physics Form 4, Pages 64-69

Floating and Sinking

Archimedes' Principle and Moments

By the end of the lesson, the learner should be able to:
Perform Experiment 3.3 determining relative density using moments; Understand the principle of moments in relative density determination; Plot graphs of d₁ against d₂ and determine slopes; Apply moments method to determine relative density of liquids; Explain advantages of moments method over direct weighing

Q/A on relative density calculations; Setup and performance of Experiment 3.3 - relative density using moments; Data collection and graph plotting; Analysis of graph slopes and their significance; Application to liquids determination; Discussion of method advantages and accuracy

Metre rule; Clamps and stands; Solid objects; Metal blocks; Water and other liquids; Graph paper; Calculators; Data recording tables; Balance setup materials

KLB Secondary Physics Form 4, Pages 71-74

Floating and Sinking
Electromagnetic Spectrum

Applications - Hydrometer and Practical Instruments
Applications - Ships, Submarines, and Balloons
Introduction and Properties of Electromagnetic Waves

By the end of the lesson, the learner should be able to:
Explain the working principle of hydrometers; Describe structure and features of practical hydrometers; Solve Examples 12 and 13 involving hydrometer calculations; Understand applications in measuring density of milk, battery acid, and beer; Calculate hydrometer dimensions and floating positions
Define electromagnetic waves and identify their nature; State properties common to all electromagnetic waves; Arrange electromagnetic radiations in order of wavelength and frequency; Calculate wave properties using c = fλ; Solve Examples 1 and 2 from textbook

Review of law of flotation through Q/A; Detailed study of hydrometer structure and operation; Analysis of hydrometer sensitivity and design features; Step-by-step solution of Examples 12-13; Discussion of specialized hydrometers (lactometer, battery acid hydrometer); Practical calculations involving hydrometer floating
Q/A on wave concepts from previous studies; Introduction to electromagnetic waves using everyday examples; Study of electromagnetic spectrum chart; Discussion of wave properties (speed, frequency, wavelength); Mathematical relationship between wave parameters; Solution of Examples 1 and 2 involving calculations

Hydrometer (if available); Different density liquids; Measuring cylinders; Calculators; Examples from textbook; Charts showing hydrometer types; Battery acid hydrometer demonstration
Model ships and submarines; Balloon demonstrations; Charts showing ship cross-sections; Submarine ballast tank models; Different density materials; Calculators; Application examples
Electromagnetic spectrum charts; Wave demonstration materials; Calculators; Radio; Mobile phone; Examples from textbook; Charts showing wave properties

KLB Secondary Physics Form 4, Pages 74-77
KLB Secondary Physics Form 4, Pages 79-81

Electromagnetic Spectrum

Production and Detection of Electromagnetic Waves I

By the end of the lesson, the learner should be able to:
Explain production of gamma rays, X-rays, and ultraviolet radiation; Describe detection methods for high-energy radiations; Understand energy transitions in atoms and nuclei; Relate wave energy to frequency using E = hf; Solve Example 3 involving X-ray calculations

Review of electromagnetic properties through Q/A; Study of high-energy radiation production mechanisms; Analysis of detection methods (photographic plates, G-M tubes, fluorescent materials); Discussion of atomic and nuclear energy changes; Step-by-step solution of Example 3; Safety considerations for high-energy radiations

Charts showing radiation production; Photographic film; Fluorescent materials; UV lamp (if available); Geiger counter (if available); Example 3 materials; Safety equipment demonstrations

KLB Secondary Physics Form 4, Pages 81-82

Electromagnetic Spectrum

Production and Detection of Electromagnetic Waves II
Applications of Electromagnetic Waves I

By the end of the lesson, the learner should be able to:
Explain production of visible light, infrared, microwaves, and radio waves; Describe detection methods for each radiation type; Understand role of oscillating circuits in radio wave production; Compare detection mechanisms across the spectrum; Demonstrate detection of some radiations

Q/A on high-energy radiations; Study of lower-energy radiation production (thermal, electronic oscillations); Analysis of detection methods (eyes, thermopiles, crystal detectors, radio receivers); Practical demonstrations of infrared detection; Discussion of antenna and oscillating circuit principles; Group identification of sources and detectors

Infrared sources (heaters); Thermometer with blackened bulb; Radio receivers; Microwave oven (demonstration); Oscillating circuit models; Various electromagnetic sources
X-ray photographs; Medical imaging examples; Industrial radiography charts; Cancer treatment information; Sterilization process diagrams; Safety protocol charts

KLB Secondary Physics Form 4, Pages 81-82

Electromagnetic Spectrum

Applications of Electromagnetic Waves II

By the end of the lesson, the learner should be able to:
Explain applications of ultraviolet radiation; Describe uses of visible light in technology; Understand infrared applications in heating and imaging; Analyze microwave applications in cooking and radar; Discuss radio wave applications in communication

Q/A on high-energy radiation applications; Study of UV applications (fluorescence, sterilization, vitamin D, forgery detection); Analysis of visible light uses (photography, optical fibers, lasers); Exploration of infrared applications (heating, night vision, remote controls); Discussion of microwave and radio wave technologies

UV lamp demonstrations; Optical fiber samples; Infrared thermometer; Microwave oven (demonstration); Radio equipment; Remote controls; Radar images; Communication devices

KLB Secondary Physics Form 4, Pages 82-85

Electromagnetic Spectrum
Electromagnetic Induction

Specific Applications - Radar and Microwave Cooking
Hazards and Safety Considerations
Introduction and Historical Background

By the end of the lesson, the learner should be able to:
Explain principles of radar (radio detection and ranging); Describe microwave oven operation and safety features; Understand reflection and detection in radar systems; Explain how microwaves heat food molecules; Apply wave principles to practical technologies
Define electromagnetic induction and its significance; Explain Faraday's discovery and its impact on modern technology; Understand the relationship between magnetism and electricity; Identify examples of electromagnetic induction in daily life; Appreciate the importance of relative motion in electromagnetic phenomena

Review of microwave and radio wave properties; Detailed analysis of radar operation and applications; Study of microwave oven components (magnetron, stirrer, safety features); Discussion of wave reflection and detection principles; Analysis of molecular heating mechanisms; Safety considerations and precautions
Q/A on magnetic fields and electric current relationships from previous studies; Introduction to Michael Faraday's discovery and its historical significance; Discussion of electromagnetic induction examples in daily life (generators, transformers, motors); Overview of chapter content and learning objectives; Introduction to practical applications in power generation and electronics

Radar system diagrams; Microwave oven cross-section charts; Wave reflection demonstrations; Safety instruction materials; Magnetron information; Aircraft/ship tracking examples
Radiation hazard charts; Safety equipment demonstrations; Chernobyl disaster information; Biological effect diagrams; Safety protocol materials; Radiation protection examples
Charts showing Faraday's experiments; Pictures of power stations; Transformers; Generators; Historical timeline of electromagnetic discoveries; Real-world applications display

KLB Secondary Physics Form 4, Pages 84-85
KLB Secondary Physics Form 4, Pages 86

Electromagnetic Induction

Conditions for Electromagnetic Induction - Straight Conductor
Conditions for Electromagnetic Induction - Coils

By the end of the lesson, the learner should be able to:
Perform Experiment 5.1 using straight conductor; Identify conditions necessary for inducing e.m.f. in a straight conductor; Observe effects of different types of motion on induced current; Understand the importance of relative motion between conductor and magnetic field; Analyze galvanometer deflections

Performance of Experiment 5.1 using straight conductor AB in U-shaped magnet; Systematic investigation of conductor movement (vertical up/down, parallel to field, stationary, different angles); Observation and recording of galvanometer deflections; Analysis of current direction changes with motion reversal; Discussion of relative motion importance and field cutting concept

Thick electric conductor; U-shaped magnet; Galvanometer; Connecting wires; Clamp and stand setup; Data recording sheets
Coils of different sizes; Magnets of various strengths; Galvanometer; Connecting wires; Comparison data sheets

KLB Secondary Physics Form 4, Pages 86-87

Electromagnetic Induction

Factors Affecting Induced E.M.F. - Rate of Change

By the end of the lesson, the learner should be able to:
Perform Experiment 5.2 investigating rate of change effects; Understand relationship between speed of motion and induced e.m.f.; Collect and analyze data on rate of flux change; Establish that faster changes produce larger e.m.f.; Apply findings to practical situations

Performance of Experiment 5.2 investigating relationship between rate of change of magnetic flux and induced e.m.f.; Systematic variation of magnet withdrawal speeds (very fast, moderate, very slow); Recording and comparison of galvanometer deflections; Data analysis and conclusion drawing; Discussion of practical implications in generators and other applications

Coil of at least 50 turns; Sensitive galvanometer; Magnet; Stopwatch; Data collection tables; Graph paper for analysis

KLB Secondary Physics Form 4, Pages 88-89

Electromagnetic Induction

Factors Affecting Induced E.M.F. - Magnetic Field Strength

By the end of the lesson, the learner should be able to:
Perform Experiment 5.3 investigating magnetic field strength effects; Understand relationship between field strength and induced e.m.f.; Control variables in electromagnetic experiments; Use electromagnets to vary field strength; Apply experimental findings to solve problems

Performance of Experiment 5.3 investigating relationship between magnetic field strength and induced e.m.f.; Setup of electromagnet with variable current control; Investigation of wire PQ movement in different field strengths; Recording galvanometer deflections for different electromagnet currents; Analysis of results and relationship establishment

U-shaped electromagnet; Variable resistor; Wire PQ; Galvanometer; Ammeter; Connecting wires; Power supply; Data recording materials

KLB Secondary Physics Form 4, Pages 89

Electromagnetic Induction

Factors Affecting Induced E.M.F. - Number of Turns
Lenz's Law and Direction of Induced Current
Fleming's Right-Hand Rule

By the end of the lesson, the learner should be able to:
Perform Experiment 5.4 investigating effect of coil turns; Understand relationship between number of turns and induced e.m.f.; Construct coils with different numbers of turns; Analyze why more turns produce larger e.m.f.; State Faraday's law of electromagnetic induction
Perform Experiment 5.6 with straight conductors; State Fleming's right-hand rule (dynamo rule); Apply the rule to determine direction of induced current; Understand relationship between motion, field, and current directions; Solve Example 1 involving square loop movement

Performance of Experiment 5.4 investigating relationship between number of turns and induced e.m.f.; Construction of solenoids with 60, 50, 40, 30, and 20 turns; Systematic testing with same magnet withdrawal speed; Recording and analysis of galvanometer readings; Mathematical relationship establishment; Statement of Faraday's law based on experimental evidence
Performance of Experiment 5.6 determining induced current direction in straight conductor; Introduction and demonstration of Fleming's right-hand rule; Practice applying the rule to various conductor movements; Step-by-step solution of Example 1 (square loop in magnetic field); Analysis of current directions in different parts of the loop; Verification of Fleming's rule consistency with Lenz's law

Insulated copper wire; Sensitive galvanometer; Magnet; Connecting wires; Wire cutting and measuring tools; Data analysis sheets
Variable resistor; Sensitive center-zero galvanometer; Connecting wires; Coil; Magnet; Switch; Battery; Direction analysis charts
U-shaped magnet; Thick wire AB; Marked center-zero galvanometer; Hand models for rule demonstration; Example 1 setup materials; Direction analysis worksheets

KLB Secondary Physics Form 4, Pages 89-90
KLB Secondary Physics Form 4, Pages 93-97

Electromagnetic Induction

Applications of Induction Laws
Mutual Induction

By the end of the lesson, the learner should be able to:
Solve Examples 2 and 3 involving current direction; Apply Lenz's law to predict current directions in circuits; Understand induced current effects in neighboring circuits; Analyze changing magnetic fields and their effects; Use both Fleming's rule and Lenz's law in problem solving

Q/A review of Fleming's rule and Lenz's law; Step-by-step solution of Example 2 (current in conductor AB affecting nearby loop); Detailed analysis of Example 3 (magnet movement and coil current direction); Practice problems involving current direction prediction; Group work on applying both laws to various scenarios; Discussion of consistency between different methods

Examples 2 and 3 setup materials; Problem-solving worksheets; Charts showing current direction analysis; Group work materials; Calculators
Two coils P and S; Galvanometer; Battery; A.C. power source; Switch; Rheostat; Connecting wires; Soft iron rod; Soft iron ring; Enhancement demonstration materials

KLB Secondary Physics Form 4, Pages 94-97

Electromagnetic Induction

Transformers - Basic Principles

By the end of the lesson, the learner should be able to:
Describe transformer structure and components; Explain working principle based on mutual induction; Perform Experiment 5.10 investigating secondary e.m.f. variation; Understand primary and secondary coil functions; Distinguish between step-up and step-down transformers

Review of mutual induction through Q/A; Introduction to transformer structure (primary coil, secondary coil, iron core); Performance of Experiment 5.10 - variation of secondary e.m.f. with number of turns; Observation of bulb brightness changes with turn variations; Analysis of step-up vs step-down transformer characteristics; Introduction to transformer symbols and representations

Long insulated copper wire; Soft iron rod; Low frequency A.C. source; A.C. voltmeter; Switch; Bulb; Transformer construction materials; Symbol charts

KLB Secondary Physics Form 4, Pages 100-102

Electromagnetic Induction

Transformer Equations and Calculations
Transformer Energy Losses and Example 6

By the end of the lesson, the learner should be able to:
Derive transformer turns rule equation; Apply transformer equations for voltage and current relationships; Calculate transformer efficiency; Solve Examples 4 and 5 involving transformer problems; Understand ideal vs practical transformer differences

Q/A on transformer working principles; Mathematical derivation of turns rule (Vp/Vs = Np/Ns); Development of current relationship (IpVp = IsVs for ideal transformer); Introduction to efficiency calculations; Step-by-step solution of Examples 4 and 5; Discussion of ideal transformer assumptions vs practical limitations

Calculators; Examples 4 and 5 materials; Mathematical derivation charts; Efficiency calculation worksheets; Transformer specification data
Charts showing energy losses; Laminated core samples; Example 6 complex setup; Power transmission diagrams; Efficiency calculation materials; Loss minimization demonstration aids

KLB Secondary Physics Form 4, Pages 102-105

Electromagnetic Induction
Mains Electricity

Applications - Generators, Microphones, and Induction Coils
Sources of Mains Electricity
The Grid System and Power Transmission
High Voltage Transmission and Power Losses

By the end of the lesson, the learner should be able to:
Explain structure and working of A.C. and D.C. generators; Describe moving-coil microphone operation; Understand induction coil structure and applications; Compare slip rings with split ring commutators; Analyze generator output waveforms and applications

State the main sources of mains electricity
Explain how different sources generate electrical energy
Compare advantages and disadvantages of different power sources
Describe the environmental impact of various power sources

Review of electromagnetic induction in rotating systems; Detailed study of A.C. generator structure and sinusoidal output; Analysis of D.C. generator with split ring commutator; Explanation of moving-coil microphone components and sound conversion; Description of induction coil operation and high voltage generation; Discussion of applications in car ignition systems
Prior knowledge review on electrical energy
Discussion on local power sources in Kenya
Field trip planning to nearby power station
Group presentations on different power sources
Q&A session on power generation methods

A.C. generator model; D.C. generator model; Moving-coil microphone demonstration; Induction coil setup; Output waveform charts; Slip ring and commutator comparisons; Bicycle dynamo
Pictures of power stations
Charts showing different energy sources
Videos of power generation
Maps of Kenya's power grid
Sample coal, biomass materials
Chart of national grid system
Transmission line models
Maps showing power lines
Transformer models
Voltage measurement devices
Calculators
Worked example sheets
Pictures of transmission towers
Safety warning signs
Formula charts

KLB Secondary Physics Form 4, Pages 108-112
KLB Secondary Physics Form 4, Pages 117

Mains Electricity

Domestic Wiring System
Fuses, Circuit Breakers and Safety Devices
Ring Mains Circuit and Three-Pin Plugs

By the end of the lesson, the learner should be able to:

Describe the domestic wiring system
Identify components of consumer fuse box
Explain the function of live, neutral and earth wires
Draw simple domestic wiring circuits

Q&A on transmission systems
Examination of house wiring components
Drawing domestic wiring diagrams
Identification of electrical safety features
Practical observation of electrical installations

House wiring components
Fuse box model
Different types of fuses
Electrical cables (samples)
Circuit diagrams
Multimeter
Various fuses (2A, 5A, 13A)
Circuit breakers
Fuse wire samples
Electrical appliances
Calculators
Safety equipment samples
Three-pin plugs
Electrical cables
Wire strippers
Screwdrivers
Ring mains circuit model
Color-coded wires

KLB Secondary Physics Form 4, Pages 121-124

Mains Electricity
Cathode Rays and Cathode Ray Tube

Electrical Energy Consumption and Costing
Problem Solving and Applications
Thermionic Emission

By the end of the lesson, the learner should be able to:

Define kilowatt-hour (kWh)
Calculate electrical energy consumption
Determine cost of electrical energy
Apply energy formulas to practical problems

Review of power and energy concepts
Introduction to kilowatt-hour unit
Worked examples on energy calculations
Practice problems on electricity billing
Analysis of electricity bills

Calculators
Sample electricity bills
Electrical appliances with ratings
Stop watches
Energy meter model
Formula charts
Problem sheets
Past examination questions
Real electricity bills
Energy conservation charts
Simple thermionic emission apparatus
Low voltage power supply (6V)
Milliammeter
Evacuated glass bulb
Heated filament
Charts showing electron emission

KLB Secondary Physics Form 4, Pages 125-128

Cathode Rays and Cathode Ray Tube

Production and Properties of Cathode Rays
Structure of Cathode Ray Oscilloscope
CRO Controls and Operation

By the end of the lesson, the learner should be able to:

Describe how cathode rays are produced
State the properties of cathode rays
Explain evidence that cathode rays are streams of electrons
Demonstrate properties using simple experiments

Review of thermionic emission
Description of cathode ray tube construction
Demonstration of cathode ray properties
Experiments showing straight line travel and shadow formation
Discussion on deflection by electric and magnetic fields

Cathode ray tube (simple)
High voltage supply (EHT)
Fluorescent screen
Maltese cross or opaque object
Bar magnets
Charged plates
CRO (demonstration model)
Charts showing CRO structure
Diagrams of electron gun
Models of deflection plates
High voltage power supply
Working CRO
Signal generator
Connecting leads
Various input signals
Time base control charts
Oscilloscope manual

KLB Secondary Physics Form 4, Pages 131-133

Cathode Rays and Cathode Ray Tube
Cathode Rays and Cathode Ray Tube
X-Rays
X-Rays

CRO as a Voltmeter
Frequency Measurement using CRO
The Television Tube
Problem Solving and Applications
Production of X-Rays
Properties of X-Rays and Energy Concepts

By the end of the lesson, the learner should be able to:

Use CRO to measure DC and AC voltages
Calculate voltage using deflection and sensitivity
Compare CRO with conventional voltmeters
Apply the formula: Voltage = deflection × sensitivity

Solve numerical problems on CRO measurements
Apply CRO principles to practical situations
Analyze waveforms displayed on CRO
Evaluate the importance of cathode ray technology

Q&A on CRO operation
Demonstration of voltage measurement using CRO
Practical measurement of known voltages
Calculation exercises using CRO readings
Comparison with digital voltmeter readings
Review of all chapter concepts
Problem-solving exercises on voltage and frequency measurements
Analysis of complex waveforms
Discussion on modern applications of cathode ray technology
Assessment preparation

Working CRO
DC power supplies
AC signal sources
Digital voltmeter
Connecting leads
Graph paper
Calculators
Working CRO with time base
Audio frequency generator
Graph paper for measurements
Stop watch
TV tube (demonstration model)
Deflection coils
TV receiver (old CRT type)
Charts comparing TV and CRO
Color TV tube diagram
Calculators
Problem-solving worksheets
Sample CRO traces
Past examination questions
Graph paper
Reference materials
Charts showing X-ray tube structure
Diagram of X-ray production process
Models of rotating anode
Pictures of medical X-ray equipment
Video clips of X-ray tube operation
Electromagnetic spectrum chart
Energy calculation worksheets
Constants and formulae charts
Sample X-ray images

KLB Secondary Physics Form 4, Pages 137-139
KLB Secondary Physics Form 4, Pages 131-142

X-Rays

Hard and Soft X-Rays
Uses of X-Rays in Medicine and Industry

By the end of the lesson, the learner should be able to:

Distinguish between hard and soft X-rays
Explain factors affecting X-ray hardness
Relate accelerating voltage to X-ray penetrating power
Describe intensity and quantity control of X-rays

Q&A on X-ray properties and energy
Comparison of hard and soft X-rays characteristics
Discussion on penetrating power differences
Explanation of voltage effects on X-ray quality
Analysis of X-ray intensity control methods

Comparison charts of hard vs soft X-rays
Penetration demonstration materials
Voltage control diagrams
Medical X-ray examples
Industrial X-ray applications
Medical X-ray images
CT scan pictures
Industrial radiography examples
Crystal diffraction patterns
Airport security equipment photos
Charts of various X-ray applications

KLB Secondary Physics Form 4, Pages 147-148

X-Rays
Photoelectric Effect

Dangers of X-Rays and Safety Precautions
Problem Solving and Applications Review
Demonstration and Introduction to Photoelectric Effect

By the end of the lesson, the learner should be able to:

Explain the dangers of X-ray exposure
Describe cumulative effects of radiation
State safety precautions for X-ray workers
Explain protective measures in X-ray facilities

Q&A on X-ray applications
Discussion on biological effects of X-rays
Explanation of radiation protection principles
Description of lead shielding and protective equipment
Analysis of safety protocols in medical facilities

Safety equipment samples (lead aprons)
Radiation warning signs
Pictures of X-ray protection facilities
Dosimeter badges
Charts showing radiation effects
Safety protocol posters
Calculators
Problem-solving worksheets
Past examination questions
Real X-ray case studies
Modern X-ray technology articles
Assessment materials
UV lamp (mercury vapor)
Zinc plate
Gold leaf electroscope
Glass barrier
Metal plates
Galvanometer
Connecting wires

KLB Secondary Physics Form 4, Pages 149

Photoelectric Effect

Light Energy and Quantum Theory
Einstein's Photoelectric Equation and Work Function
Factors Affecting Photoelectric Effect

By the end of the lesson, the learner should be able to:

Explain Planck's quantum theory of light
Define photon and quantum of energy
Apply the equation E = hf to calculate photon energy
Compare energies of different wavelength radiations

Review of photoelectric effect observations
Introduction to Planck's constant and quantum theory
Calculation of photon energies for different wavelengths
Worked examples comparing red and violet light energies
Problem-solving exercises on photon energy

Calculators
Electromagnetic spectrum chart
Planck's constant reference
Worked example sheets
Wave equation materials
Color filters
Work function data table
Einstein's equation reference
Metal samples (theoretical)
Energy level diagrams
Problem-solving worksheets
Experimental setup diagrams
Graph paper
Stopping potential data
Frequency vs energy graphs
Different metal characteristics

KLB Secondary Physics Form 4, Pages 153

Photoelectric Effect
Radioactivity

Applications of Photoelectric Effect
Problem Solving and Applications Review
Atomic Structure and Nuclear Notation
Nuclear Stability and Discovery of Radioactivity
Types of Radiations
Alpha and Beta Decay Processes

By the end of the lesson, the learner should be able to:

Describe the working of photoemissive cells
Explain photovoltaic and photoconductive cells
Analyze applications in counting, alarms, and sound reproduction
Compare different types of photoelectric devices

Explain nuclear stability and instability
Describe Becquerel's discovery of radioactivity
Interpret the stability curve (N vs Z graph)
Identify conditions for radioactive decay

Q&A on factors affecting photoelectric effect
Demonstration of photocell operation
Explanation of different photoelectric device types
Analysis of practical applications in industry
Discussion on solar cells and light-dependent resistors
Review of atomic structure concepts
Historical account of radioactivity discovery
Analysis of nuclear stability curve
Discussion on neutron-to-proton ratios
Explanation of why some nuclei are unstable

Photoemissive cell samples
Light-dependent resistor (LDR)
Solar panel demonstration
Application circuit diagrams
Conveyor belt counting model
Burglar alarm circuit
Calculators
Comprehensive problem sets
Past examination questions
Constants and formulae sheets
Graph paper
Assessment materials
Atomic structure models
Periodic table
Nuclear notation examples
Isotope charts
Atomic structure diagrams
Element samples (safe)
Historical pictures of scientists
Stability curve graph
Nuclear stability charts
Uranium compound samples (pictures)
Photographic plate demonstrations
Magnetic field demonstration setup
Radiation source (simulation)
Lead box model
Nuclear equation examples
Property comparison charts
Deflection diagrams
Nuclear equation worksheets
Decay chain diagrams
Calculators
Periodic table
Practice problem sets
Worked examples

KLB Secondary Physics Form 4, Pages 160-163
KLB Secondary Physics Form 4, Pages 166-168

Radioactivity

Penetrating Power of Radiations
Ionising Effects of Radiations
Radiation Detectors - Photographic Emulsions and Cloud Chambers

By the end of the lesson, the learner should be able to:

Compare penetrating powers of alpha, beta, and gamma radiations
Describe absorption of radiations by different materials
Explain the concept of half-thickness
Design experiments to test penetrating power

Q&A on decay processes
Demonstration of penetrating power using absorbers
Comparison of radiation ranges in air and materials
Explanation of half-thickness concept
Analysis of absorption curves

Absorber materials (paper, aluminum, lead)
Radiation detector simulation
Absorption curve graphs
Range measurement diagrams
Safety equipment models
Penetration demonstration setup
Ionization chamber models
Ion formation diagrams
Comparison charts of ionizing power
Air molecule models
Energy transfer illustrations
Ionization applications examples
Photographic film samples
Cloud chamber diagrams
Track pattern examples
Dry ice demonstration setup
Alcohol vapor materials
Detection comparison charts

KLB Secondary Physics Form 4, Pages 170-172

Radioactivity

Geiger-Muller Tube and Background Radiation
Decay Law and Mathematical Treatment

By the end of the lesson, the learner should be able to:

Describe the structure and operation of G-M tubes
Explain gas amplification and pulse detection
Define background radiation and its sources
Account for background radiation in measurements

Review of cloud chamber operation
Detailed explanation of G-M tube construction
Description of avalanche effect and electron multiplication
Discussion on background radiation sources
Practice with count rate corrections

G-M tube model/diagram
High voltage supply diagrams
Pulse amplification illustrations
Background radiation source charts
Count rate measurement examples
Cosmic ray detection materials
Mathematical formula charts
Decay curve examples
Calculators
Exponential function graphs
Statistical concepts illustrations
Decay constant calculations

KLB Secondary Physics Form 4, Pages 175-176

Radioactivity

Half-life Calculations and Applications

By the end of the lesson, the learner should be able to:

Define half-life of radioactive materials
Calculate half-life from experimental data
Use half-life in decay calculations
Plot and interpret decay graphs

Review of decay law and mathematical concepts
Explanation of half-life concept with examples
Practice calculations using half-life formula
Graph plotting and interpretation exercises
Problem-solving with half-life applications

Graph paper
Calculators
Half-life data tables
Decay curve examples
Sample calculation problems
Radioactive material half-life charts

KLB Secondary Physics Form 4, Pages 178-181

Radioactivity

Applications of Radioactivity - Carbon Dating and Medicine
Industrial and Agricultural Applications
Hazards of Radiation and Safety Precautions

By the end of the lesson, the learner should be able to:

Explain carbon dating principles
Describe medical uses of radioisotopes
Analyze radiotherapy and diagnostic applications
Calculate ages using carbon-14 dating

Explain biological effects of radiation exposure
Describe acute and chronic radiation effects
State safety precautions for handling radioactive materials
Analyze radiation protection principles

Q&A on half-life calculations
Explanation of carbon-14 formation and decay
Worked examples of carbon dating calculations
Discussion on medical applications of radiation
Analysis of radiotherapy and sterilization uses
Q&A on radioactivity applications
Discussion on radiation damage to living cells
Explanation of radiation sickness and cancer risks
Description of safety equipment and procedures
Analysis of radiation protection in hospitals and labs

Carbon dating examples
Archaeological samples (pictures)
Medical radioisotope charts
Gamma ray therapy illustrations
Dating calculation worksheets
Medical application diagrams
Industrial thickness gauge models
Flaw detection examples
Tracer experiment diagrams
Agricultural application charts
Leak detection illustrations
Industrial radiography samples
Safety equipment samples
Radiation warning signs
Protective clothing examples
Lead shielding materials
Dosimeter badges
Safety protocol posters

KLB Secondary Physics Form 4, Pages 181-182
KLB Secondary Physics Form 4, Pages 182-183

Radioactivity

Nuclear Fission Process and Chain Reactions
Nuclear Fusion and Energy Applications

By the end of the lesson, the learner should be able to:

Define nuclear fission
Describe the fission of uranium-235
Explain chain reactions and critical mass
Analyze energy release in nuclear fission

Review of radiation safety concepts
Explanation of nuclear fission mechanism
Description of uranium-235 bombardment and splitting
Analysis of chain reaction development
Discussion on controlled vs uncontrolled reactions

Nuclear fission diagrams
Chain reaction illustrations
Uranium nucleus models
Neutron bombardment demonstrations
Energy release calculations
Nuclear reactor pictures
Nuclear fusion reaction diagrams
Stellar fusion illustrations
Fusion reactor concepts
Energy comparison charts
Temperature and pressure requirement data
Fusion research pictures

KLB Secondary Physics Form 4, Pages 183-184

Radioactivity
Electronics

Comprehensive Review and Problem Solving
Introduction to Electronics and Energy Band Theory

By the end of the lesson, the learner should be able to:

Solve complex radioactivity problems
Apply all radioactivity concepts to practical situations
Analyze examination-type questions
Evaluate nuclear technology benefits and risks

Comprehensive review of all chapter concepts
Problem-solving sessions covering decay, half-life, and applications
Analysis of nuclear equations and calculations
Discussion on future of nuclear technology
Assessment and evaluation exercises

Calculators
Comprehensive problem sets
Past examination questions
Nuclear data tables
Assessment materials
Reference books
Electronic devices samples
Energy level diagrams
Band theory charts
Atomic structure models
Crystal lattice illustrations
Energy band comparison charts

KLB Secondary Physics Form 4, Pages 166-184

Electronics

Conductors, Semiconductors, and Insulators
Intrinsic Semiconductors and Crystal Structure
Doping Process and Extrinsic Semiconductors

By the end of the lesson, the learner should be able to:

Classify materials as conductors, semiconductors, or insulators
Explain energy band diagrams for different materials
Compare forbidden energy gaps in different materials
Relate band structure to electrical conductivity

Review of energy band theory concepts
Drawing and comparing energy band diagrams
Analysis of energy gap differences
Demonstration of conductivity differences
Discussion on temperature effects on conductivity

Material samples (metals, semiconductors, insulators)
Energy band diagrams for each type
Conductivity measurement setup
Temperature effect illustrations
Comparison charts
Multimeter for resistance testing
Silicon crystal models
Covalent bonding diagrams
Semiconductor samples
Crystal lattice structures
Electron-hole illustrations
Temperature demonstration materials
Doping process diagrams
Pure vs doped semiconductor samples
Impurity atom models
Conductivity comparison charts
Doping concentration illustrations
Electronic structure diagrams

KLB Secondary Physics Form 4, Pages 187-189

Electronics

n-type Semiconductors
p-type Semiconductors
Fixed Ions and Charge Carrier Movement
The p-n Junction Formation
Biasing the p-n Junction

By the end of the lesson, the learner should be able to:

Describe formation of n-type semiconductors
Identify pentavalent donor atoms
Explain majority and minority charge carriers
Analyze charge neutrality in n-type materials

Describe formation of p-n junction
Explain charge carrier diffusion across junction
Define depletion layer and its properties
Analyze potential barrier formation

Q&A on doping processes
Detailed explanation of pentavalent atom doping
Drawing n-type semiconductor structure
Analysis of electron as majority carrier
Discussion on electrical neutrality maintenance
Review of charge carriers in doped semiconductors
Explanation of junction formation process
Description of initial charge diffusion
Analysis of depletion layer creation
Introduction to potential barrier concept

n-type semiconductor models
Pentavalent atom diagrams
Charge carrier illustrations
Donor atom examples (phosphorus, arsenic)
Majority/minority carrier charts
Crystal structure with impurities
p-type semiconductor models
Trivalent atom diagrams
Hole formation illustrations
Acceptor atom examples (boron, gallium)
Comparison charts
Crystal structure with acceptor atoms
Fixed ion diagrams
Charge mobility illustrations
Thermal excitation models
Electric field effect demonstrations
Carrier movement animations
Temperature effect charts
p-n junction models
Diffusion process diagrams
Depletion layer illustrations
Potential barrier graphs
Junction formation animations
Electric field diagrams
Biasing circuit diagrams
Forward bias demonstration setup
Reverse bias configuration
Current flow illustrations
Barrier potential graphs
Bias voltage sources

KLB Secondary Physics Form 4, Pages 190-191
KLB Secondary Physics Form 4, Pages 192-193

Electronics

Semiconductor Diode Characteristics

By the end of the lesson, the learner should be able to:

Describe diode structure and symbol
Plot I-V characteristics of a diode
Explain cut-in voltage and breakdown voltage
Analyze non-ohmic behavior of diodes

Review of p-n junction biasing
Introduction to diode as electronic component
Experimental plotting of diode characteristics
Analysis of forward and reverse characteristics
Discussion on breakdown phenomena

Actual diodes (various types)
Diode characteristic curve graphs
Voltmeter and ammeter
Variable voltage source
Circuit breadboard
Graph plotting materials

KLB Secondary Physics Form 4, Pages 194-197

Electronics

Diode Circuit Analysis and Problem Solving
Rectification - Half-wave and Full-wave
Smoothing Circuits and Applications Review

By the end of the lesson, the learner should be able to:

Solve circuits containing ideal diodes
Analyze diode states (conducting/non-conducting)
Calculate current and voltage in diode circuits
Apply diode characteristics to practical problems

Q&A on diode characteristics
Analysis of simple diode circuits
Problem-solving with ideal diode assumption
Determination of diode states in circuits
Practice with circuit calculations

Circuit analysis worksheets
Diode circuit examples
Calculators
Circuit simulation software
Problem-solving guides
Worked example sheets
Rectifier circuit diagrams
AC signal generator
Oscilloscope for waveform display
Transformer (center-tapped)
Bridge rectifier circuit
Load resistors
Smoothing capacitors
Ripple waveform displays
Efficiency calculation sheets
Power supply applications
Comprehensive problem sets
Assessment materials

KLB Secondary Physics Form 4, Pages 196-197