Current Electricity (II)

Types of Resistors and Their Applications

By the end of the lesson, the learner should be able to:
Identify different types of resistors
-Understand fixed and variable resistors
-Read resistor color codes
-Understand applications of special resistors
-Use rheostats and potentiometers

Review ohmic vs non-ohmic conductors through Q/A
-Identification of resistor types: carbon, wire-wound, variable
-Practice reading resistor color codes
-Demonstration: rheostat and potentiometer operation
-Discussion on thermistors and LDR applications
-Practical applications in circuits

Various resistor types
-Color code charts
-Rheostat
-Potentiometer
-Thermistor
-LDR
-Multimeter
-Circuit boards
-Application examples

KLB Secondary Physics Form 3, Pages 135-140

Current Electricity (II)

Measurement of Resistance - Voltmeter-Ammeter Method

By the end of the lesson, the learner should be able to:
Describe voltmeter-ammeter method
-Set up circuits for resistance measurement
-Calculate resistance from V and I readings
-Understand limitations of the method
-Analyze experimental errors

Q/A on resistor types
-Setup of voltmeter-ammeter circuit
-Measurement of voltage and current for unknown resistor
-Calculation of resistance using R = V/I
-Discussion on measurement errors and accuracy
-Comparison with multimeter readings

Unknown resistors
-Voltmeter
-Ammeter
-Rheostat
-Connecting wires
-Dry cells
-Switches
-Calculator
-Multimeter for comparison

KLB Secondary Physics Form 3, Pages 140-142

Current Electricity (II)

Wheatstone Bridge Method
Resistors in Series - Theory and Calculations

By the end of the lesson, the learner should be able to:
Understand the principle of Wheatstone bridge
-Set up Wheatstone bridge circuit
-Balance the bridge for resistance measurement
-Calculate unknown resistance using bridge equation
-Appreciate accuracy of Wheatstone bridge method
Derive formula for resistors in series
-Calculate total resistance for series combination
-Understand current and voltage in series circuits
-Solve problems involving series resistors
-Apply series resistance in circuit analysis

Review voltmeter-ammeter method through Q/A
-Introduction to Wheatstone bridge principle
-Demonstration of bridge balance condition
-Setup and operation of Wheatstone bridge
-Calculation using R₁/R₂ = R₃/R₄
-Comparison of accuracy with other methods
Q/A on resistance measurement methods
-Derivation of Rs = R₁ + R₂ + R₃...
-Demonstration: measuring total resistance of series combination
-Analysis of current (same) and voltage (divided) in series
-Worked examples on series resistance calculations
-Problem-solving session

Wheatstone bridge apparatus
-Galvanometer
-Known resistors
-Unknown resistors
-Connecting wires
-Battery
-Calculator
-Bridge equation charts
Resistors of known values
-Multimeter
-Connecting wires
-Circuit boards
-Calculator
-Series circuit diagrams
-Problem worksheets

KLB Secondary Physics Form 3, Pages 142-144
KLB Secondary Physics Form 3, Pages 144-147

Current Electricity (II)

Resistors in Parallel - Theory and Calculations

By the end of the lesson, the learner should be able to:
Derive formula for resistors in parallel
-Calculate total resistance for parallel combination
-Understand current and voltage in parallel circuits
-Solve problems involving parallel resistors
-Apply parallel resistance in circuit analysis

Review series resistance through Q/A
-Derivation of 1/Rp = 1/R₁ + 1/R₂ + 1/R₃...
-Demonstration: measuring total resistance of parallel combination
-Analysis of voltage (same) and current (divided) in parallel
-Worked examples on parallel resistance calculations
-Problem-solving session

Resistors of known values
-Multimeter
-Connecting wires
-Circuit boards
-Calculator
-Parallel circuit diagrams
-Problem worksheets

KLB Secondary Physics Form 3, Pages 147-150

Current Electricity (II)

Mixed Circuits - Series-Parallel Combinations

By the end of the lesson, the learner should be able to:
Analyze circuits with series-parallel combinations
-Apply reduction techniques to complex circuits
-Calculate total resistance of mixed circuits
-Determine current and voltage in different branches
-Solve complex circuit problems

Q/A on parallel resistance
-Introduction to mixed circuit analysis techniques
-Step-by-step reduction of complex circuits
-Worked examples on series-parallel combinations
-Problem-solving on mixed circuits
-Discussion on circuit analysis strategies

Various resistors
-Circuit boards
-Connecting wires
-Multimeter
-Calculator
-Complex circuit diagrams
-Step-by-step analysis charts

KLB Secondary Physics Form 3, Pages 150-153

Current Electricity (II)

Electromotive Force (EMF) and Terminal Voltage

By the end of the lesson, the learner should be able to:
Define electromotive force (EMF)
-Distinguish between EMF and terminal voltage
-Understand the concept of lost voltage
-Relate EMF to work done by the cell
-Measure EMF using high resistance voltmeter

Review mixed circuits through Q/A
-Definition of EMF as work done per unit charge
-Demonstration: measuring EMF with open circuit
-Comparison of EMF and terminal voltage under load
-Discussion on energy conversion in cells
-Measurement techniques for EMF

High resistance voltmeter
-Various cells
-Switches
-Resistors
-Connecting wires
-EMF measurement setup
-Energy conversion charts

KLB Secondary Physics Form 3, Pages 150-152

Current Electricity (II)

Internal Resistance of Cells
Cells in Series and Parallel

By the end of the lesson, the learner should be able to:
Define internal resistance
-Understand the relationship E = V + Ir
-Calculate internal resistance experimentally
-Understand factors affecting internal resistance
-Apply internal resistance in circuit calculations
Analyze cells connected in series
-Analyze cells connected in parallel
-Calculate total EMF and internal resistance
-Understand advantages of different connections
-Solve problems involving cell combinations

Q/A on EMF concepts
-Introduction to internal resistance concept
-Derivation of E = V + Ir relationship
-Experiment: measuring internal resistance using different loads
-Plotting E vs R graph to find internal resistance
-Discussion on factors affecting internal resistance
Review internal resistance through Q/A
-Analysis of identical cells in series connection
-Analysis of identical cells in parallel connection
-Calculation of equivalent EMF and internal resistance
-Discussion on practical applications and advantages
-Problem-solving on cell combinations

Various cells
-Resistors of different values
-Voltmeter
-Ammeter
-Connecting wires
-Graph paper
-Calculator
-Internal resistance apparatus
Multiple identical cells
-Connecting wires
-Voltmeter
-Ammeter
-Resistors
-Calculator
-Cell combination diagrams
-Problem worksheets

KLB Secondary Physics Form 3, Pages 150-153
KLB Secondary Physics Form 3, Pages 152-153

Current Electricity (II)
Waves II

Advanced Circuit Analysis and Problem Solving
Properties of waves

By the end of the lesson, the learner should be able to:
Apply Kirchhoff's laws to complex circuits
-Solve circuits with multiple sources
-Analyze circuits with internal resistance
-Use systematic approaches to circuit problems
-Integrate all electricity concepts

Q/A on cell combinations
-Application of Kirchhoff's current and voltage laws
-Systematic approach to complex circuit analysis
-Worked examples with multiple EMF sources
-Problem-solving session covering all electricity topics
-Discussion on practical circuit applications

Complex circuit examples
-Calculator
-Circuit analysis worksheets
-Multiple EMF sources
-Various resistors
-Comprehensive problem sets
-Kirchhoff's law charts
Ripple tank, Straight vibrator, Water, Rulers, Stroboscope, Charts on wave properties

KLB Secondary Physics Form 3, Pages 126-153

Waves II

Reflection of waves
Refraction of waves

By the end of the lesson, the learner should be able to:
State laws of reflection for waves
- Describe experiments showing reflection
- Sketch reflected wave patterns
- Explain behavior at different reflectors

Review of reflection principles
- Experiment showing plane waves on straight reflector
- Observation of circular waves on concave and convex reflectors
- Drawing wavefront diagrams

Ripple tank, Plane wave generator, Curved and straight reflectors, Graph paper, Pencils
Ripple tank, Glass plates, Water, Rulers for measurement, Frequency generator

KLB Secondary Physics Form 3, Pages 158-161

Waves II

Diffraction of waves
Interference patterns

By the end of the lesson, the learner should be able to:
Define diffraction
- Explain factors affecting extent of diffraction
- Describe experiments showing diffraction
- Compare diffraction through different gap sizes

Demonstration of diffraction using various gap sizes
- Observation of spreading effect
- Investigation of relationship between gap size and wavelength
- Practical measurements

Ripple tank, Barriers with gaps, Various gap sizes, Measuring instruments, Wave generator
Two-point sources, Graph paper, Compass, Rulers, Ripple tank setup, Audio frequency generator

KLB Secondary Physics Form 3, Pages 163-165

Waves II

Constructive and destructive interference
Stationary waves formation
Modes of vibration in strings
Vibrating air columns - closed pipes

By the end of the lesson, the learner should be able to:
Distinguish between constructive and destructive interference
- Explain conditions for each type
- Demonstrate using sound waves
- Calculate amplitudes in interference
Derive expressions for fundamental frequency
- Explain harmonics and overtones
- Calculate frequencies of overtones
- Demonstrate different modes

Experiment with two loudspeakers
- Observation of loud and quiet regions
- Mathematical analysis of amplitude addition
- Problem solving on wave interference
Discussion on fundamental and overtone frequencies
- Mathematical derivation of frequency formulas
- Practical demonstration of string vibrations
- Problem solving

Two loudspeakers, Audio generator, Microphone, Sound level meter, Connecting wires
Tuning fork, String, Pulley, Weights, Stroboscope, Measuring tape, Retort stands
Sonometer, Tuning forks, Weights, Measuring instruments, Calculator, Formula charts
Closed pipes of various lengths, Tuning forks, Water, Measuring cylinders, Resonance tubes

KLB Secondary Physics Form 3, Pages 167-169
KLB Secondary Physics Form 3, Pages 170-172

Waves II
Electrostatics II

Vibrating air columns - open pipes
Electric field patterns and charge distribution

By the end of the lesson, the learner should be able to:
Compare open and closed pipe resonance
- Derive frequency formulas for open pipes
- Explain harmonic series differences
- Solve numerical problems

Experiment with open pipe resonance
- Comparison with closed pipe results
- Mathematical problem solving
- Summary of all wave phenomena

Open pipes, Tuning forks, Sound level meters, Calculators, Summary charts, Past papers
High voltage source, Wire electrodes, Petri-dish, Castor oil, Chalk dust, Spherical and pear-shaped conductors, Proof-plane, Gold-leaf electroscope

KLB Secondary Physics Form 3, Pages 174-176

Electrostatics II

Lightning arrestor and capacitance introduction
Factors affecting capacitance and types of capacitors

By the end of the lesson, the learner should be able to:
Explain working principle of lightning arrestor
- Describe charge concentration at sharp points
- Define capacitance and state SI units
- Describe parallel-plate capacitor structure

Demonstration of charge concentration at points using wind-mill experiment
- Discussion on lightning protection applications
- Introduction to capacitance concept
- Demonstration of capacitor charging process

Wind-mill model, Point charges, Lightning arrestor photos, Parallel-plate capacitors, Battery, Voltmeter, Milliammeter
Aluminium plates, Various dielectric materials, Electroscope, Paper capacitors, Electrolytic capacitors, Variable air capacitors, Measuring instruments

KLB Secondary Physics Form 3, Pages 181-185

Electrostatics II

Capacitors in series and parallel
Energy stored in capacitors

By the end of the lesson, the learner should be able to:
Derive effective capacitance for series combination
- Derive effective capacitance for parallel combination
- Explain charge and voltage relationships
- Calculate individual charges and voltages

Mathematical derivation of series formula (1/C = 1/C₁ + 1/C₂)
- Mathematical derivation of parallel formula (C = C₁ + C₂)
- Problem solving with capacitor combinations
- Practical verification using circuits

Capacitors of different values, Voltmeters, Ammeters, Battery, Connecting wires, Calculators, Circuit boards
Charged capacitors, Energy calculation worksheets, Graphing materials, Calculators, Safety equipment

KLB Secondary Physics Form 3, Pages 188-191

Electrostatics II
Heating Effect of Electric Current

Complex capacitor problems
Applications of capacitors
Introduction to heating effect
Factors affecting heat produced - current and time

By the end of the lesson, the learner should be able to:
Solve problems involving mixed series and parallel combinations
- Calculate charges, voltages and energies in complex circuits
- Apply energy conservation principles
- Analyze capacitor charging and discharging
Define heating effect of electric current
- Explain mechanism of heat production in conductors
- Investigate effect of current on resistance wire
- Observe temperature changes in conductors

Problem solving with complex capacitor networks
- Analysis of charging and discharging processes
- Energy transfer calculations
- Graph interpretation of charging curves
Q/A on electric current from previous units
- Experiment investigating effect of current on coil temperature
- Observation of heating in different parts of circuit
- Discussion on electron collision mechanism

Complex circuit diagrams, Advanced problem worksheets, Graphing materials, Calculators, Past examination papers
Circuit diagrams, Smoothing circuit demo, Radio tuning circuits, Camera flash unit, Revision charts, Past examination papers
Battery, Resistance wire coils, Ammeter, Variable resistor, Thermometer, Stopwatch, Connecting wires
Resistance coils, Variable resistor, Ammeter, Thermometer, Stopwatch, Graph paper, Different current values

KLB Secondary Physics Form 3, Pages 188-193
KLB Secondary Physics Form 3, Pages 195-197

Heating Effect of Electric Current

Factors affecting heat produced - resistance
Joule's law and electrical energy

By the end of the lesson, the learner should be able to:
Investigate relationship between heat produced and resistance
- Compare heating in different resistance wires
- State H ∝ R relationship
- Derive complete heating formula H = I²Rt

Experiment using coils of different resistance
- Temperature measurements with constant current
- Comparison of heating rates
- Mathematical derivation of heating law

Coils of different resistance, Ammeter, Thermometer, Measuring instruments, Stopwatch, Calculation worksheets
Formula charts, Calculators, Problem worksheets, Electrical devices for analysis

KLB Secondary Physics Form 3, Pages 199-200

Heating Effect of Electric Current

Electrical power and energy calculations
Applications - electrical lighting and heating devices

By the end of the lesson, the learner should be able to:
Define electrical power P = VI = I²R = V²/R
- Calculate electrical energy W = Pt
- Convert between different units (J, kWh)
- Solve complex power problems

Derivation of electrical power formulas
- Energy unit conversions
- Problem solving on household appliances
- Cost calculations for electrical consumption

Calculators, Unit conversion charts, Household appliance ratings, Electricity bills, Problem sets
Filament lamps, Electric iron, Electric kettle, Heating elements, Energy saving bulbs, Appliance diagrams

KLB Secondary Physics Form 3, Pages 201-202

Heating Effect of Electric Current

Electrical safety - fuses and circuit protection
Efficiency calculations and motor problems

By the end of the lesson, the learner should be able to:
Explain working principle of fuses
- Calculate appropriate fuse ratings
- Describe safety measures in electrical installations
- Analyze circuit protection methods

Demonstration of fuse operation
- Calculation of fuse ratings for appliances
- Discussion on electrical safety
- Analysis of circuit protection devices

Various fuses, Fuse holders, Circuit diagrams, Safety equipment demonstrations, Rating calculations
Motor specifications, Efficiency calculation worksheets, Power meters, Mechanical loading systems

KLB Secondary Physics Form 3, Pages 203-204

Heating Effect of Electric Current
Quantity of Heat

Series and parallel heating circuits
Heat capacity and specific heat capacity
Determination of specific heat capacity - method of mixtures for solids
Determination of specific heat capacity - electrical method

By the end of the lesson, the learner should be able to:
Analyze heating in series and parallel circuits
- Calculate power dissipation in different configurations
- Compare heating effects in different circuit arrangements
- Solve complex circuit problems
Describe method of mixtures for solids
- Perform experiment to determine specific heat capacity of metal
- Apply heat balance principle
- Calculate specific heat capacity from experimental data

Circuit analysis of heating effects
- Comparison of series vs parallel heating
- Power distribution calculations
- Complex circuit problem solving
Experiment using hot metal block in cold water
- Measurement of temperatures and masses
- Application of heat balance equation
- Calculation of specific heat capacity from results

Resistors in circuits, Ammeters, Voltmeters, Power calculation sheets, Circuit boards
Charts on heat definitions, Calculators, Simple problem worksheets, Various materials for comparison
Metal blocks, Beakers, Water, Thermometers, Weighing balance, Heat source, Well-lagged calorimeter, Stirrer
Metal cylinder with heater, Voltmeter, Ammeter, Thermometer, Stopwatch, Insulating materials, Power supply

KLB Secondary Physics Form 3, Pages 200-204
KLB Secondary Physics Form 3, Pages 209-212

Quantity of Heat

Specific heat capacity of liquids and continuous flow method
Change of state and latent heat concepts

By the end of the lesson, the learner should be able to:
Determine specific heat capacity of water by electrical method
- Describe continuous flow method
- Explain advantages of continuous flow method
- Solve problems on specific heat capacity

Electrical method experiment for water
- Discussion on continuous flow apparatus
- Analysis of method advantages
- Problem solving on specific heat calculations

Calorimeter, Electrical heater, Water, Measuring instruments, Continuous flow apparatus diagram, Problem sets
Naphthalene, Test tubes, Thermometer, Stopwatch, Graph paper, Heat source, Cooling apparatus

KLB Secondary Physics Form 3, Pages 214-217

Quantity of Heat

Specific latent heat of fusion
Specific latent heat of vaporization

By the end of the lesson, the learner should be able to:
Define specific latent heat of fusion
- Determine latent heat of ice by method of mixtures
- Perform electrical method for latent heat
- Calculate latent heat from experimental data

Method of mixtures experiment using ice and warm water
- Electrical method using ice and immersion heater
- Heat balance calculations
- Determination of specific latent heat values

Ice, Calorimeter, Thermometer, Electrical heater, Filter funnels, Beakers, Measuring cylinders
Steam generator, Condenser, Calorimeter, Electrical heater, Measuring instruments, Safety equipment

KLB Secondary Physics Form 3, Pages 220-223

Quantity of Heat

Effects of pressure and impurities on melting and boiling points
Evaporation and cooling effects

By the end of the lesson, the learner should be able to:
Investigate effect of pressure on melting point of ice
- Demonstrate regelation phenomenon
- Investigate effect of pressure on boiling point
- Explain effect of impurities on phase transition temperatures

Regelation experiment with ice and wire
- Pressure effect on boiling point using flask
- Salt solution boiling point investigation
- Discussion on pressure cooker working

Ice blocks, Weighted wire, Round-bottomed flask, Thermometer, Salt solutions, Pressure cooker model
Various liquids, Beakers, Fans, Thermometers, Ether, Test tubes, Humidity measuring devices

KLB Secondary Physics Form 3, Pages 227-230

Gas Laws

Introduction to gas behavior and Boyle's Law
Boyle's Law experiments and calculations
Boyle's Law applications and kinetic theory explanation
Charles's Law
Charles's Law applications and absolute temperature scale

By the end of the lesson, the learner should be able to:
Describe relationship between pressure and volume of gases
- State Boyle's Law
- Demonstrate pressure-volume relationship using syringe
- Plot P vs V and P vs 1/V graphs
State Charles's Law for constant pressure processes
- Demonstrate volume-temperature relationship
- Perform experiments to verify V ∝ T relationship
- Plot V vs T and V vs θ graphs

Q/A on gas properties from previous studies
- Demonstration using syringe to show pressure-volume relationship
- Discussion on molecular explanation
- Introduction to gas law investigations
Experiment using gas column in tube with varying temperature
- Temperature and volume measurements
- Graph plotting showing linear relationship
- Discussion on absolute zero concept

Syringes, J-shaped tubes, Oil, Bourdon gauge, Foot pump, Metre rule, Graph paper
Thick-walled J-shaped tube, Oil, Pressure gauge, Measuring instruments, Data tables, Graph paper, Calculators
Problem worksheets, Kinetic theory diagrams, Calculator, Gas bubble scenarios, Atmospheric pressure data
Gas tubes, Water baths, Thermometers, Measuring cylinders, Heating apparatus, Graph paper, Temperature control equipment
Temperature conversion charts, Problem sets, Calculators, Hot air balloon examples, Gas heating scenarios

KLB Secondary Physics Form 3, Pages 235-237
KLB Secondary Physics Form 3, Pages 238-241

Gas Laws

Pressure Law (Gay-Lussac's Law)
Combined gas laws and ideal gas behavior

By the end of the lesson, the learner should be able to:
State relationship between pressure and temperature at constant volume
- Demonstrate pressure-temperature experiments
- Verify P ∝ T relationship
- Derive pressure law formula

Experiment using constant volume gas with temperature variation
- Pressure measurements at different temperatures
- Graph plotting of P vs T
- Verification of linear relationship through origin

Constant volume gas apparatus, Pressure gauges, Temperature control, Water baths, Thermometers, Graph materials
Combined law worksheets, Complex problem sets, Calculators, Ideal gas assumption charts

KLB Secondary Physics Form 3, Pages 242-244

Gas Laws

Kinetic theory of gases
Absolute zero and temperature scales

By the end of the lesson, the learner should be able to:
State basic assumptions of kinetic theory
- Explain gas laws using molecular motion
- Relate temperature to average kinetic energy
- Analyze molecular behavior in different conditions

Discussion of kinetic theory postulates
- Molecular explanation of gas laws
- Mathematical relationship between temperature and kinetic energy
- Analysis of molecular motion at different temperatures

Kinetic theory diagrams, Molecular motion animations, Temperature-energy relationship charts, Theoretical discussion materials
Graph paper, Extrapolation exercises, Temperature scale diagrams, Conversion worksheets, Scientific calculators

KLB Secondary Physics Form 3, Pages 244-245

Gas Laws

Comprehensive applications and problem solving

By the end of the lesson, the learner should be able to:
Solve complex multi-step gas law problems
- Apply gas laws to real-world situations
- Analyze atmospheric and weather-related phenomena
- Review all gas law concepts and applications

Comprehensive problem solving session
- Analysis of weather balloons, scuba diving, and atmospheric pressure effects
- Review of all gas laws
- Preparation for examinations with complex scenarios

Past examination papers, Multi-step problem sets, Real-world scenario worksheets, Summary charts, Calculators

KLB Secondary Physics Form 3, Pages 235-245

Thin Lenses

Types of Lenses and Effects on Light
Definition of Terms and Ray Diagrams
Image Formation by Converging Lenses
Image Formation by Diverging Lenses and Linear Magnification

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
Locate images for different object positions using ray diagrams; Describe image characteristics (real/virtual, erect/inverted, magnified/diminished); Explain applications in telescope, camera, projector and magnifying glass; Understand relationship between object position and image properties

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
Review of ray construction rules; Systematic ray diagram construction for objects at infinity, beyond 2F, at 2F, between F and 2F, at F, and between F and lens; Analysis of image characteristics for each position; Discussion of practical applications; Demonstration using lens, object and screen

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

KLB Secondary Physics Form 4, Pages 1-6
KLB Secondary Physics Form 4, Pages 8-12

Thin Lenses

The Lens Formula
Determination of Focal Length I

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

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

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

KLB Secondary Physics Form 4, Pages 14-20

Thin Lenses

Determination of Focal Length II
Power of Lens and Simple Microscope

By the end of the lesson, the learner should be able to:
Determine focal length using lens formula method (Experiment 1.4); Plot and analyze 1/u vs 1/v graphs; Determine focal length from displacement method (Experiment 1.5); Solve Examples 8, 9, and 10 involving graphical methods

Review of previous focal length methods; Setup and performance of Experiment 1.4; Data collection and graph plotting; Analysis of Examples 8-10; Introduction to displacement method and conjugate points; Practical work with different graphical approaches

Experimental setup materials; Graph paper; Calculators; Data tables; Examples 8-10 from textbook; Materials for displacement method
Various lenses of different focal lengths; Magnifying glasses; Small objects; Calculators; Power calculation charts; Small print materials; Biological specimens

KLB Secondary Physics Form 4, Pages 19-25

Thin Lenses

Compound Microscope

By the end of the lesson, the learner should be able to:
Describe structure and working of compound microscope; Explain functions of objective lens and eyepiece; Calculate total magnification; Solve Example 11 involving lens separation; Understand normal adjustment of compound microscope

Review of simple microscope; Introduction to compound microscope structure; Ray tracing through objective and eyepiece; Mathematical analysis of total magnification; Step-by-step solution of Example 11; Practical demonstration with microscope parts

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 28-30

Thin Lenses

The Human Eye
Defects of Vision

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
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

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
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/models of human eye; Torch for demonstrations; Eye model with flexible lens; Objects at various distances; Measuring equipment; Camera comparison charts
Charts showing vision defects; Converging and diverging lenses; Eye models; Spectacles with different lenses; Vision test materials; Ray diagram materials

KLB Secondary Physics Form 4, Pages 30-32
KLB Secondary Physics Form 4, Pages 32-33

Thin Lenses

The Camera and Applications Review

By the end of the lesson, the learner should be able to:
Describe camera structure and working principles; Explain functions of camera lens, shutter, aperture, and film; Compare camera with human eye highlighting similarities and differences; Review all applications of lenses in optical instruments

Review of optical instruments studied; Analysis of camera components and their functions; Detailed comparison of camera and eye; Discussion of focusing mechanisms; Comprehensive review of lens applications in telescope, microscope, camera, spectacles, and magnifying glass

Camera (if available); Charts showing camera structure; Comparison tables; Review charts of all applications; Summary materials; Demonstration equipment

KLB Secondary Physics Form 4, Pages 33-35

Uniform Circular Motion

Introduction and Angular Displacement
Angular Velocity and Linear Velocity

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

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

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

KLB Secondary Physics Form 4, Pages 37-39

Uniform Circular Motion

Centripetal Acceleration

By the end of the lesson, the learner should be able to:
Explain why circular motion involves acceleration despite constant speed; Derive centripetal acceleration formula a = v²/r = rω²; Understand direction of centripetal acceleration; Solve Example 3 from textbook; Apply acceleration concepts to circular motion problems

Q/A review of velocity and acceleration concepts; Explanation of acceleration in circular motion using vector analysis; Mathematical derivation of centripetal acceleration; Discussion of acceleration direction (toward center); Step-by-step solution of Example 3; Practical demonstration of centripetal acceleration effects

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 40-42

Uniform Circular Motion

Centripetal Force and Factors Affecting It
Experimental Investigation of Centripetal Force

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
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

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
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

Metal pegs; Turntable and motor; Variable resistor; Dry cell; Metal ball and string; Spring balance; Clock; Graph paper; Calculators
Same apparatus as Experiment 2.1; Graph paper; Additional measuring equipment; Data recording tables; Calculators; Analysis worksheets

KLB Secondary Physics Form 4, Pages 42-47
KLB Secondary Physics Form 4, Pages 44-47

Uniform Circular Motion

Case Examples - Cars and Banking

By the end of the lesson, the learner should be able to:
Explain circular motion of cars on level roads; Understand role of friction in providing centripetal force; Describe banking of roads and its advantages; Derive critical speed for banked tracks; Explain aircraft banking principles

Review of centripetal force concepts; Analysis of car motion on circular bends; Discussion of friction as centripetal force; Introduction to banked roads and critical speed; Mathematical analysis of banking angles; Explanation of aircraft banking mechanisms; Problem-solving involving banking situations

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 47-50

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

Motion in Vertical Circle

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)

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

String and masses for vertical motion; Bucket and water (demonstration); Model loop-the-loop track; Force analysis charts; Safety equipment; Calculators

KLB Secondary Physics Form 4, Pages 52-54

Uniform Circular Motion
Floating and Sinking

Applications - Centrifuges and Satellites
Introduction and Cause of Upthrust

By the end of the lesson, the learner should be able to:
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
Explain why objects feel lighter in fluids; Define upthrust and identify its effects; Perform Experiment 3.1 investigating upthrust and weight of fluid displaced; Derive mathematical expression for upthrust using pressure concepts; Verify Archimedes' principle experimentally

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
Q/A on pressure in liquids; Introduction using steel ferry floating on water; Performance of Experiment 3.1 - relationship between upthrust and weight of displaced fluid; Mathematical derivation of upthrust U = ρVg; Analysis of experimental results; Discussion of pressure differences causing upthrust

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 54-55
KLB Secondary Physics Form 4, Pages 58-63

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

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

KLB Secondary Physics Form 4, Pages 64-69

Floating and Sinking

Relative Density Determination

By the end of the lesson, the learner should be able to:
Define relative density of solids and liquids; Use Archimedes' principle to determine relative density; Apply the formula: RD = Weight in air/(Weight in air - Weight in fluid); Solve Examples 8, 9, 10, 11, and 12 from textbook; Calculate relative density using different methods

Review of density concepts through Q/A; Introduction to relative density using practical examples; Mathematical derivation of relative density formulae; Step-by-step solution of Examples 8-12; Practical determination of relative density for various materials; Group calculations and comparisons

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 69-74

Floating and Sinking

Archimedes' Principle and Moments
Applications - Hydrometer and Practical Instruments

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
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

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
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

Metre rule; Clamps and stands; Solid objects; Metal blocks; Water and other liquids; Graph paper; Calculators; Data recording tables; Balance setup materials
Hydrometer (if available); Different density liquids; Measuring cylinders; Calculators; Examples from textbook; Charts showing hydrometer types; Battery acid hydrometer demonstration

KLB Secondary Physics Form 4, Pages 71-74
KLB Secondary Physics Form 4, Pages 74-77

Floating and Sinking

Applications - Ships, Submarines, and Balloons

By the end of the lesson, the learner should be able to:
Explain how steel ships float on water; Describe working principle of submarines; Understand how balloons achieve lift and control altitude; Analyze the role of displaced fluid in each application; Apply principles to solve practical problems involving floating vessels

Q/A on hydrometer applications; Analysis of ship design and floating principles; Detailed study of submarine operation and ballast tanks; Exploration of balloon physics and gas density effects; Discussion of load limits and stability; Problem-solving involving practical floating applications

Model ships and submarines; Balloon demonstrations; Charts showing ship cross-sections; Submarine ballast tank models; Different density materials; Calculators; Application examples

KLB Secondary Physics Form 4, Pages 77