Mechanics and Thermal Physics

Energy, Work, Power and Machines - MA, VR and efficiency
Energy, Work, Power and Machines - Levers

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

- Define mechanical advantage, velocity ratio and efficiency
- Calculate MA, VR and efficiency of machines
- Explain why efficiency is always less than 100% due to friction in real machines

In groups, learners are guided to:
- Discuss meaning of MA, VR and efficiency
- Calculate MA and VR from experimental data
- Relate efficiency to energy losses

Why is the efficiency of machines always less than 100%?

- Spotlight Physics Learner's Book pg. 129
- Simple machines
- Spring balance
- Known masses
- Metre rule
- Spotlight Physics Learner's Book pg. 131
- Lever apparatus

- Written tests - Problem-solving - Practical assessment

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Pulleys

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

- Calculate VR of pulley systems
- Investigate efficiency of pulley systems
- Connect pulley systems to cranes, flagpoles and construction hoists

In groups, learners are guided to:
- Set up single fixed and movable pulleys
- Set up block and tackle system
- Calculate MA, VR and efficiency experimentally

How does the number of pulleys affect the velocity ratio?

- Spotlight Physics Learner's Book pg. 131
- Pulleys
- String
- Known masses
- Spring balance
- Stand

- Practical assessment - Written tests - Observation

Mechanics and Thermal Physics

Energy, Work, Power and Machines - Inclined plane and screw
Energy, Work, Power and Machines - Wheel and axle, gears
Energy, Work, Power and Machines - Hydraulic machines and applications

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

- Calculate VR of inclined plane as length/height
- Calculate VR of screw using pitch and circumference
- Connect inclined planes to loading ramps and wheelchair access, and screws to car jacks

- Calculate VR of wheel and axle
- Calculate VR of gear systems
- Connect wheel and axle to steering wheels and door knobs, and gears to bicycles and car gearboxes

In groups, learners are guided to:
- Roll objects up inclined plane at different angles
- Calculate VR of inclined plane
- Discuss relationship between screw and inclined plane
- Demonstrate wheel and axle operation
- Calculate VR of gear systems with different teeth
- Solve problems on wheel and axle and gears

How does the angle of inclination affect the effort required?
How do gears change speed and force?

- Spotlight Physics Learner's Book pg. 134
- Inclined plane
- Screw jack
- Spring balance
- Metre rule
- Spotlight Physics Learner's Book pg. 137
- Wheel and axle model
- Gear wheels
- Bicycle
- Spotlight Physics Learner's Book pg. 139
- Syringes of different sizes
- Tubing
- Water
- Pictures of hydraulic machines

- Practical assessment - Written tests - Problem-solving
- Practical assessment - Written tests - Oral questions

Waves and Optics

Properties of Waves - Rectilinear propagation of waves
Properties of Waves - Reflection of waves

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

- Explain the meaning of rectilinear propagation of waves
- Demonstrate rectilinear propagation using sound and light examples
- Relate wave propagation to everyday experiences like torch beams and speaker systems

In groups, learners are guided to:

- Discuss with peers the meaning of rectilinear propagation of waves
- Observe how sound travels from a teacher facing different directions
- Use digital resources to search for applications of rectilinear propagation

How do waves travel from their source?

- Spotlight Physics Grade 10 pg. 147
- Torch
- Digital resources
- Spotlight Physics Grade 10 pg. 148
- Digital resources
- Charts showing reflection

- Oral questions - Observation - Written assignments

Waves and Optics

Properties of Waves - Refraction of waves
Properties of Waves - Diffraction of waves
Properties of Waves - Interference of waves

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

- Explain the meaning of refraction of waves
- Demonstrate refraction using a straight object in water
- Relate refraction to why sound travels differently during day and night

In groups, learners are guided to:

- Observe how a straight object appears bent when placed in water
- Discuss how sound waves bend at the interface of cold and hot air
- Illustrate refraction of sound waves during day and night

Why does a stick appear bent in water?

- Spotlight Physics Grade 10 pg. 150
- Glass of water
- Straight object
- Digital resources
- Spotlight Physics Grade 10 pg. 151
- Torch
- Manila paper
- Spotlight Physics Grade 10 pg. 152
- Two identical speakers
- Audio frequency generator

- Observation - Oral questions - Written tests

Waves and Optics

Properties of Waves - Demonstrating rectilinear propagation using ripple tank
Properties of Waves - Demonstrating reflection using ripple tank
Properties of Waves - Demonstrating refraction using ripple tank

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

- Set up a ripple tank to demonstrate wave properties
- Demonstrate rectilinear propagation of waves in a ripple tank
- Connect the formation of bright and dark spots to how water waves behave

In groups, learners are guided to:

- Set up a ripple tank with all accessories
- Observe how crests appear bright and troughs appear dark
- Place two straight rods perpendicular to the vibrating bar and observe wave direction

How do waves move in a straight line?

- Spotlight Physics Grade 10 pg. 154
- Ripple tank and accessories
- Dry cell and cell holder
- White manila paper
- Spotlight Physics Grade 10 pg. 156
- Ripple tank
- Straight metal reflector
- Concave and convex reflectors
- Spotlight Physics Grade 10 pg. 158
- Transparent glass plate

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Demonstrating diffraction using ripple tank
Properties of Waves - Demonstrating interference using ripple tank
Properties of Waves - Production of frequency modulated (FM) waves

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

- Demonstrate diffraction of waves using a ripple tank
- Investigate how aperture size affects diffraction
- Connect diffraction to how radio waves reach behind buildings

- Demonstrate interference of waves using a ripple tank
- Identify constructive and destructive interference patterns
- Relate interference patterns to noise-cancelling headphones and acoustic design

In groups, learners are guided to:

- Place two metal barriers with an aperture in front of plane waves
- Vary the aperture size from 8 cm to 0.5 cm and observe emerging waves
- Place an obstacle in front of waves and observe diffraction around it

- Fix two spherical balls below the vibrator bar as coherent sources
- Observe dark and bright radial lines showing interference pattern
- Discuss how bright lines show constructive and dark lines show destructive interference

What factors determine the extent of wave diffraction?
How are interference patterns formed in a ripple tank?

- Spotlight Physics Grade 10 pg. 159
- Ripple tank
- Two straight metal barriers
- Opaque obstacle
- Spotlight Physics Grade 10 pg. 160
- Ripple tank
- Two spherical balls
- White manila paper
- Spotlight Physics Grade 10 pg. 161
- Digital resources
- Physics reference books

- Practical assessment - Observation - Written assignments
- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Detection of frequency modulated (FM) waves

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

- Explain how FM waves are detected and demodulated
- Describe applications of FM in various fields
- Relate FM detection to how radios and television sets receive signals

In groups, learners are guided to:

- Discuss demodulation methods for FM signals
- Research applications of FM in radar systems, medical imaging, and telemetry
- Present findings on FM applications to classmates

How do radios detect and convert FM signals to sound?

- Spotlight Physics Grade 10 pg. 162
- Digital resources
- Radio receiver (demonstration)

- Oral questions - Written tests - Research presentations

Waves and Optics

Properties of Waves - Formation of stationary waves

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

- Explain the meaning of stationary waves
- Demonstrate formation of stationary waves using a tuning fork and string
- Connect stationary waves to how guitar strings produce different notes

In groups, learners are guided to:

- Fix a string to a tuning fork prong and pass over a fixed pulley
- Strike the tuning fork and observe nodes and antinodes
- Discuss how incident and reflected waves superimpose to form stationary waves

How are stationary waves formed in a vibrating string?

- Spotlight Physics Grade 10 pg. 163
- Tuning fork
- String
- Mass (weight)
- Fixed pulley system

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Factors affecting fundamental frequency of vibrating string
Properties of Waves - Modes of vibration in strings

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

- Investigate factors affecting fundamental frequency of a vibrating string
- Determine the relationship between frequency, tension, and length
- Relate findings to tuning musical instruments like guitars and violins

In groups, learners are guided to:

- Set up a sonometer apparatus and vary tension while keeping length constant
- Vary the length between bridges while keeping tension constant
- Discuss the mathematical relationship f = (1/2L)√(T/μ)

How do tension and length affect the frequency of a vibrating string?

- Spotlight Physics Grade 10 pg. 164
- Sonometer apparatus
- Weights
- Two wooden wedges
- Spotlight Physics Grade 10 pg. 166
- Digital resources
- Charts showing modes of vibration

- Practical assessment - Written tests - Oral questions

Waves and Optics

Properties of Waves - Stationary waves in closed pipes
Properties of Waves - Harmonics in closed pipes

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

- Investigate variation of sound with length of air column in a closed pipe
- Demonstrate resonance in a closed pipe
- Relate closed pipe resonance to how wind instruments like clarinets work

- Explain harmonics in closed pipes
- Calculate frequencies of overtones in closed pipes
- Connect closed pipe harmonics to the limited overtones in some wind instruments

In groups, learners are guided to:

- Dip a glass tube into water and hold a vibrating tuning fork over the open end
- Adjust the tube length until resonance is achieved
- Discuss the relationship between length and wavelength: L = λ/4

- Discuss the first harmonic (fundamental frequency) in closed pipes
- Calculate second and third harmonics using f = (2n-1)f₀
- Compare harmonic patterns in closed pipes with open pipes

How does the length of a closed air column affect the sound produced?
Why do closed pipes only produce odd harmonics?

- Spotlight Physics Grade 10 pg. 167
- Glass tube
- Glass jar with water
- Tuning fork

- Spotlight Physics Grade 10 pg. 168
- Digital resources
- Charts showing harmonics

- Practical assessment - Observation - Oral questions
- Written tests - Problem-solving exercises - Oral questions

Waves and Optics

Properties of Waves - Stationary waves in open pipes
Properties of Waves - Meaning of Doppler effect

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

- Explain stationary wave formation in open pipes
- Calculate fundamental frequency and overtones in open pipes
- Relate open pipe resonance to how flutes and organ pipes produce sound

In groups, learners are guided to:

- Discuss how antinodes form at both ends of an open pipe
- Calculate wavelength and frequency relationships: L = λ/2
- Compare fundamental frequencies in open and closed pipes

How do stationary waves form in open pipes?

- Spotlight Physics Grade 10 pg. 169
- Digital resources
- Charts showing open pipe harmonics
- Spotlight Physics Grade 10 pg. 173
- Audio recordings of approaching vehicles

- Written tests - Oral questions - Problem-solving exercises

Waves and Optics

Properties of Waves - Demonstrating Doppler effect

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

- Demonstrate Doppler effect using sound sources and ropes
- Observe changes in wavelength when source moves towards or away from observer
- Relate the demonstration to how radar speed guns measure vehicle speed

In groups, learners are guided to:

- Move an audio frequency generator towards and away from a stationary observer
- Use a rope to show compression and stretching of waves
- Discuss how wavelength decreases when source approaches and increases when receding

How does the movement of a sound source affect the waves detected by an observer?

- Spotlight Physics Grade 10 pg. 174
- Audio frequency generator
- Rope or spiral spring

- Practical assessment - Observation - Oral questions

Waves and Optics

Properties of Waves - Applications of Doppler effect

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

- Describe applications of Doppler effect in various fields
- Explain how Doppler effect is used in astronomy, medicine, and traffic control
- Connect Doppler applications to ultrasound scans and weather forecasting

In groups, learners are guided to:

- Research applications in astronomy for measuring galaxy movements
- Discuss medical imaging applications like Doppler sonography
- Explore traffic radar and speed camera applications

How is Doppler effect used in medicine and traffic control?

- Spotlight Physics Grade 10 pg. 175
- Digital resources
- Charts showing Doppler applications

- Research presentations - Written tests - Oral questions

Waves and Optics

Radioactivity - Meaning of radioactivity and related terms
Radioactivity - Stability of isotopes and atomic structure
Radioactivity - Types of radiations (alpha, beta, gamma)

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

- Explain the meaning of radioactivity and related terms
- Define nuclear stability, half-life, nuclide, and radioisotope
- Relate radioactivity to smoke detectors and medical treatments

- Identify the three types of radioactive radiations
- Describe the nature and charge of alpha, beta, and gamma radiations
- Relate radiation types to their uses in cancer treatment and sterilization

In groups, learners are guided to:

- Use digital resources to search for meanings of radioactivity terms
- Discuss the meaning of radioactive decay, background radiation, and nucleotide
- Share findings with classmates for peer review

- Discuss the composition of alpha particles (helium nucleus)
- Explain beta particles as high-energy electrons
- Describe gamma rays as electromagnetic radiation

What is radioactivity and why do some atoms decay?
What are the different types of radioactive emissions?

- Spotlight Physics Grade 10 pg. 178
- Digital resources
- Physics reference books
- Spotlight Physics Grade 10 pg. 180
- Charts showing atomic structure

- Spotlight Physics Grade 10 pg. 181
- Digital resources
- Charts showing radiation types

- Oral questions - Written assignments - Group discussions
- Oral questions - Written tests - Chart interpretation

Waves and Optics

Radioactivity - Properties of alpha and beta particles

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

- Describe properties of alpha and beta particles
- Compare penetrating power, ionizing ability, and speed of alpha and beta particles
- Connect alpha radiation properties to smoke detector operation

In groups, learners are guided to:

- Discuss penetrating power: alpha stopped by paper, beta by aluminium
- Compare ionizing power: alpha highest, beta moderate
- Explain deflection in electric and magnetic fields

Why are alpha particles more ionizing but less penetrating than beta particles?

- Spotlight Physics Grade 10 pg. 182
- Digital resources
- Charts comparing radiation properties

- Written tests - Oral questions - Comparison tables

Waves and Optics

Radioactivity - Properties of gamma rays and comparison of radiations
Radioactivity - Alpha decay and nuclear equations

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

- Describe properties of gamma rays
- Compare all three types of radiations using charts and diagrams
- Relate gamma ray properties to their use in X-ray imaging and cancer treatment

In groups, learners are guided to:

- Discuss gamma ray properties: no charge, no mass, highest penetration
- Make charts comparing penetrating power, ionizing effect, and field deflection
- Use diagrams to illustrate effect of magnetic and electric fields on radiations

Why are gamma rays not deflected by electric or magnetic fields?

- Spotlight Physics Grade 10 pg. 183
- Digital resources
- Charts and diagrams
- Spotlight Physics Grade 10 pg. 186
- Periodic table

- Chart making - Written tests - Oral questions

Waves and Optics

Radioactivity - Beta decay and gamma decay equations

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

- Write nuclear equations for beta and gamma decay
- Explain how beta decay changes a neutron to a proton
- Relate beta decay to carbon-14 dating of organic materials

In groups, learners are guided to:

- Discuss beta decay: neutron changes to proton and electron
- Write nuclear equation for carbon-14 decaying to nitrogen-14
- Explain gamma decay as energy release without change in mass or atomic number

How do beta and gamma decay differ from alpha decay?

- Spotlight Physics Grade 10 pg. 187
- Digital resources
- Periodic table

- Written tests - Problem-solving exercises - Oral questions

Waves and Optics

Radioactivity - Uranium-238 decay series
Radioactivity - Detection using electroscope and GM tube
Radioactivity - Cloud chambers and nuclear emulsion plates

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

- Trace the uranium-238 natural decay series
- Write nuclear equations for chain decay reactions
- Connect decay series to geological dating of rocks

- Describe detection of radioactive emissions using electroscope
- Explain the structure and operation of a Geiger-Müller tube
- Relate GM tube operation to radiation monitoring in nuclear power plants

In groups, learners are guided to:

- Study the uranium-238 decay chain from U-238 to stable Pb-206
- Identify types of radiations emitted at each stage
- Write nuclear equations for each step in the decay series

- Demonstrate how a charged electroscope loses charge near a radioactive source
- Discuss the components and operation of a GM tube
- Explain how ionization produces pulses counted by a scaler

How does uranium-238 eventually become stable lead-206?
How does a Geiger-Müller tube detect radiation?

- Spotlight Physics Grade 10 pg. 188
- Charts showing decay series
- Digital resources
- Spotlight Physics Grade 10 pg. 189
- Electroscope
- Diagrams of GM tube
- Spotlight Physics Grade 10 pg. 190
- Diagrams of cloud chambers
- Digital resources

- Chart interpretation - Written tests - Oral questions
- Practical demonstration - Oral questions - Written tests

Waves and Optics

Radioactivity - Meaning and demonstration of half-life

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

- Explain the meaning of half-life
- Demonstrate half-life concept using water draining from a burette
- Relate half-life to how long radioactive waste remains dangerous

In groups, learners are guided to:

- Define half-life as time for half the radioactive atoms to decay
- Perform water drainage experiment to simulate radioactive decay
- Plot a graph of volume against time and determine half-life

How long does it take for half of a radioactive sample to decay?

- Spotlight Physics Grade 10 pg. 193
- Burette
- Retort stand
- Stop clock

- Practical assessment - Graph plotting - Oral questions

Waves and Optics

Radioactivity - Calculating half-life using graphs and formula

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

- Calculate half-life from decay curves
- Apply the half-life formula N = N₀(½)^(T/t)
- Connect half-life calculations to determining age of archaeological samples

In groups, learners are guided to:

- Plot decay curves from given data and determine half-life
- Derive and apply the formula N = N₀(½)^(T/t)
- Solve numerical problems involving half-life calculations

How do we calculate the half-life of a radioactive substance?

- Spotlight Physics Grade 10 pg. 195
- Graph paper
- Scientific calculators

- Written tests - Problem-solving exercises - Graph interpretation

Waves and Optics

Radioactivity - Significance and applications of half-life
Radioactivity - Nuclear fission and chain reactions

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

- Explain the significance of half-life in various fields
- Describe applications in medicine, environment, and nuclear power
- Relate half-life to planning cancer treatment doses and nuclear waste storage

In groups, learners are guided to:

- Discuss significance in nuclear medicine and carbon dating
- Explain importance in nuclear waste management
- Research applications in pharmacokinetics and safety regulations

Why is understanding half-life important in medicine and nuclear power?

- Spotlight Physics Grade 10 pg. 197
- Digital resources
- Physics reference books
- Spotlight Physics Grade 10 pg. 198
- Diagrams of chain reactions
- Digital resources

- Research presentations - Written tests - Oral questions

Waves and Optics

Radioactivity - Nuclear fusion and applications
Radioactivity - Applications in medicine and industry

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

- Explain the meaning of nuclear fusion
- Compare nuclear fusion with fission
- Relate fusion to how the sun and stars produce energy

- Describe applications of radioactivity in medicine and industry
- Explain how gamma rays treat cancer and sterilize equipment
- Relate industrial applications to detecting pipe leaks and measuring thickness

In groups, learners are guided to:

- Discuss how light nuclei combine to form heavier nuclei
- Explain why fusion requires extremely high temperatures
- Compare energy released in fusion versus fission reactions

- Discuss medical applications: cancer treatment, sterilization, imaging
- Explain industrial uses: detecting pipe bursts, thickness measurement, flaw detection
- Research use of radioactive tracers in various fields

Why does nuclear fusion power the sun and stars?
How is radioactivity used to treat cancer and detect pipe leaks?

- Spotlight Physics Grade 10 pg. 199
- Diagrams showing fusion
- Digital resources

- Spotlight Physics Grade 10 pg. 200
- Diagrams showing applications
- Digital resources

- Written tests - Comparison tables - Oral questions
- Research presentations - Written tests - Oral questions

Waves and Optics

Radioactivity - Applications in agriculture and archaeology
Radioactivity - Hazards of radiation and safety precautions

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

- Describe applications of radioactivity in agriculture and archaeology
- Explain carbon dating principles
- Relate radioactive tracers to studying plant fertilizer absorption

In groups, learners are guided to:

- Discuss carbon dating for determining age of fossils and artifacts
- Explain use of radioactive tracers in agriculture
- Calculate ages using carbon-14 decay principles

How do scientists use carbon dating to determine the age of fossils?

- Spotlight Physics Grade 10 pg. 200
- Digital resources
- Charts on carbon dating
- Spotlight Physics Grade 10 pg. 201
- Safety signs
- Digital resources

- Written tests - Problem-solving - Oral questions

Electricity and Magnetism

Origin of charges in a material
The law of electrostatics
Methods of charging conductors - Induction and Contact

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

- Define electric charge and state its SI unit
- Describe the atomic structure and origin of charges in materials
- Relate static electricity to everyday experiences like clothes clinging after tumble drying

In groups, learners are guided to:
- Discuss with peers the origin of charges on materials (atom, nucleus, neutrons, protons and electrons)
- Use digital resources to search for information on atomic structure
- Perform experiments to demonstrate generation of static charges through rubbing plastic pen on woolen cloth

How do materials acquire electric charges?

- Spotlight Physics Learner's Book pg. 205
- Plastic pen, woolen cloth
- Small pieces of paper
- Digital resources
- Spotlight Physics Learner's Book pg. 207
- Balloons, woolen cloth
- Thread, retort stands
- Metre rule
- Spotlight Physics Learner's Book pg. 208
- Metallic spheres on insulated stands
- Charged polythene and glass rods
- Connecting wire for earthing

- Oral questions - Observation - Written assignments

Electricity and Magnetism

Methods of charging conductors - Separation and charge distribution
Electric field patterns

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

- Describe charging by separation method
- Illustrate charge distribution on conductors of various shapes
- Connect charge concentration at sharp points to lightning rod design

In groups, learners are guided to:
- Carry out activities to charge two spheres by separation method
- Discuss how charge distributes on spherical, pear-shaped and irregular conductors
- Draw diagrams showing charge distribution on different shaped conductors

Why does charge concentrate at pointed ends of conductors?

- Spotlight Physics Learner's Book pg. 211
- Two metallic spheres on insulated stands
- Charged rods
- Charts showing charge distribution
- Spotlight Physics Learner's Book pg. 214
- Charts showing electric field patterns
- Digital resources
- Drawing materials

- Observation - Written assignments - Diagram assessment

Electricity and Magnetism

The electroscope - Structure, charging and discharging
Uses of electroscope
Applications - Spray painting, precipitators and photocopiers
Applications - Lightning arrestors and safety measures
Applications - Touch screens, fingerprinting and capacitors

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

- Identify and explain functions of parts of a gold-leaf electroscope
- Demonstrate charging an electroscope by induction and contact
- Connect electroscope principles to static charge detectors in industry

- Explain the design and function of lightning arrestors
- Describe safety measures in transportation of flammable substances
- Relate lightning arrestors to protection of buildings during thunderstorms

In groups, learners are guided to:
- Study the various parts of the electroscope and their functions
- Carry out activities to charge an electroscope by induction and contact
- Demonstrate earthing/discharging of an electroscope
- Construct a simple electroscope using locally available materials
- Discuss the design and function of lightning arrestors
- Explain why metallic chains are attached to fuel tankers
- Research safety in transportation of flammable liquids and gases
- Discuss why people should not stand under trees during storms

How does the leaf of an electroscope respond to charging?
Why are lightning arrestors installed on tall buildings?

- Spotlight Physics Learner's Book pg. 216
- Gold-leaf electroscope
- Charged polythene and glass rods
- Conical flask, aluminium foil, metal spoon
- Spotlight Physics Learner's Book pg. 219
- Various charged materials
- Conductors and insulators for testing
- Spotlight Physics Learner's Book pg. 221
- Charts and diagrams
- Digital resources
- Videos on spray painting
- Spotlight Physics Learner's Book pg. 223
- Pictures of lightning arrestors
- Charts on safety measures
- Digital resources
- Spotlight Physics Learner's Book pg. 225
- Smartphones and tablets
- Digital resources
- Charts on touch screen technology

- Practical assessment - Observation - Oral questions
- Oral questions - Written assignments - Group discussions

Electricity and Magnetism

Current and potential difference
Electromotive force and internal resistance

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

- Define electric current and potential difference with their SI units
- Measure current using ammeter and potential difference using voltmeter
- Relate current flow to water flow in pipes for practical understanding

In groups, learners are guided to:
- Set up simple circuits with cells, bulb, ammeter and voltmeter
- Discuss current as rate of flow of charge (I = Q/t)
- Discuss potential difference as work done per unit charge (V = W/Q)
- Measure and record current and voltage in circuits

What is the relationship between charge, current and potential difference?

- Spotlight Physics Learner's Book pg. 228
- Dry cells, cell holders
- Ammeter, voltmeter, bulb
- Connecting wires, switch
- Spotlight Physics Learner's Book pg. 231
- Dry cells, two voltmeters
- Known resistors, switch
- Connecting wires

- Practical assessment - Oral questions - Written calculations

Electricity and Magnetism

Ohm's law - Verification and calculations
EMF equation and internal resistance determination
Ohmic and non-ohmic conductors

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

- State and verify Ohm's law experimentally
- Apply Ohm's law equation V = IR to solve problems
- Connect Ohm's law to selecting appropriate fuses for home appliances

In groups, learners are guided to:
- Set up circuit with nichrome wire, ammeter, voltmeter and rheostat
- Vary current and record corresponding voltages
- Plot graph of V against I and determine resistance from gradient
- Solve numerical problems using V = IR

What is the relationship between voltage and current for an ohmic conductor?

- Spotlight Physics Learner's Book pg. 232
- Nichrome wire, ammeter
- Voltmeter, rheostat
- Dry cells, graph paper
- Spotlight Physics Learner's Book pg. 236
- Dry cells, ammeter
- Graph paper
- Spotlight Physics Learner's Book pg. 242
- Torch bulb, thermistor
- Semiconductor diode
- Ammeter, voltmeter, rheostat

- Practical assessment - Graph plotting - Written calculations

Electricity and Magnetism

Factors affecting resistance - Length and cross-sectional area
Factors affecting resistance - Temperature and resistivity
Methods of determining resistance

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

- Investigate the effect of length and cross-sectional area on resistance
- Establish relationships R ∝ L and R ∝ 1/A
- Relate wire dimensions to why thick, short cables are used for car batteries

In groups, learners are guided to:
- Set up circuit with nichrome wire on metre rule
- Measure resistance at different lengths and plot R against L
- Measure resistance of wires with different diameters
- Plot R against A and establish inverse relationship

How do length and thickness of a wire affect its resistance?

- Spotlight Physics Learner's Book pg. 245
- Nichrome wire, metre rule
- Wires of different thickness
- Micrometer screw gauge, ammeter, voltmeter
- Spotlight Physics Learner's Book pg. 248
- Tungsten coil, beaker
- Thermometer, heat source
- Ammeter, voltmeter
- Spotlight Physics Learner's Book pg. 251
- Metre bridge, Wheatstone bridge components
- Galvanometer, jockey
- Resistors with colour codes

- Practical assessment - Graph plotting - Written conclusions

Electricity and Magnetism

Types of resistors and current-voltage laws
Effective resistance in series and parallel
Solving complex resistor network problems

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

- Identify and classify types of resistors (fixed, variable, linear, non-linear)
- Verify laws of current and voltage in series and parallel circuits
- Connect resistor types to volume controls and temperature sensors

- Derive and apply formulas for effective resistance in series and parallel
- Calculate effective resistance in mixed circuits
- Apply resistance calculations to design circuits for specific purposes

In groups, learners are guided to:
- Study different types of resistors and their applications
- Connect bulbs in series and verify I₁ = I₂ = I₃ and V = V₁ + V₂ + V₃
- Connect bulbs in parallel and verify I = I₁ + I₂ + I₃ and V₁ = V₂ = V₃
- Discuss applications of rheostats and potentiometers
- Derive R_T = R₁ + R₂ + R₃ for series circuits
- Derive 1/R_T = 1/R₁ + 1/R₂ + 1/R₃ for parallel circuits
- Solve problems involving series, parallel and combination circuits
- Calculate current and voltage in each resistor

Why is current the same in series but voltage the same in parallel?
How do we calculate total resistance in series and parallel circuits?

- Spotlight Physics Learner's Book pg. 255
- Various types of resistors
- Identical bulbs, ammeters
- Voltmeters, dry cells
- Spotlight Physics Learner's Book pg. 263
- Resistors of known values
- Scientific calculators
- Circuit diagrams, worksheets
- Spotlight Physics Learner's Book pg. 267
- Complex circuit diagrams
- Worksheets with problems

- Practical assessment - Oral questions - Written assignments
- Written calculations - Problem-solving tests - Oral questions

Electricity and Magnetism

Relationship of V, I and P - Power equations

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

- Derive and apply power equations P = VI, P = I²R and P = V²/R
- Calculate power consumption of electrical devices
- Relate power ratings to energy efficiency of household appliances

In groups, learners are guided to:
- Discuss electrical power as rate of energy conversion
- Derive power equations from P = W/t and Ohm's law
- Calculate power in circuits using different formulas
- Compare power ratings of various appliances

What is the relationship between voltage, current and power?

- Spotlight Physics Learner's Book pg. 270
- Scientific calculators
- Power rating labels from appliances
- Worksheets

- Written calculations - Oral questions - Problem-solving tests