Refraction of Light

Introduction to Refraction and Basic Phenomena

By the end of the lesson, the learner should be able to:
Define refraction of light
-Explain why light bends when passing from one medium to another
-Identify examples of refraction in daily life
-Distinguish between optically dense and optically rare media
-Describe the behavior of light at interfaces

Q/A on light behavior students observe daily
-Demonstration: stick in water appearing bent
-Demonstration: coin in beaker appearing raised
-Discussion on swimming pool appearing shallow
-Observation of refraction using glass block and pins
-Drawing ray diagrams showing refraction
-Safety precautions when handling glass

Glass blocks
-Beakers
-Water
-Coins
-Sticks/pencils
-Pins
-White paper
-Ray box (if available)
-Charts showing refraction examples

KLB Secondary Physics Form 3, Pages 33-35

Refraction of Light

Laws of Refraction and Snell's Law

By the end of the lesson, the learner should be able to:
State the two laws of refraction
-Define refractive index and state its symbol
-Apply Snell's law: sin i/sin r = constant
-Understand that incident ray, refracted ray and normal lie in same plane
-Calculate refractive index from experimental data

Review refraction phenomena through Q/A
-Experiment: investigating refraction through glass block
-Measuring angles of incidence and refraction
-Plotting graph of sin i against sin r
-Derivation and application of Snell's law
-Worked examples calculating refractive index
-Discussion on significance of constant ratio

Glass blocks
-Pins
-Protractor
-Ruler
-White paper
-Graph paper
-Calculator
-Ray box
-Soft board
-Drawing pins

KLB Secondary Physics Form 3, Pages 35-39

Refraction of Light

Absolute and Relative Refractive Index
Real and Apparent Depth

By the end of the lesson, the learner should be able to:
Define absolute and relative refractive index
-Relate refractive index to speed of light in different media
-Apply the relationship n = c/v
-Calculate relative refractive index between two media
-Solve problems involving refractive indices
Explain why objects under water appear nearer than actual position
-Define real depth, apparent depth and vertical displacement
-Derive the relationship n = real depth/apparent depth
-Calculate apparent depth and vertical displacement
-Apply concepts to practical situations

Q/A review on Snell's law and calculations
-Discussion on light speed in different media
-Derivation of n = c/v relationship
-Explanation of absolute vs relative refractive index
-Worked examples with multiple media
-Problem-solving session with real materials
-Group work on refractive index calculations
Review refractive index through Q/A
-Demonstration: coin at bottom of beaker appears raised
-Experiment: measuring real and apparent depth
-Derivation of n = real depth/apparent depth
-Worked examples on swimming pools, tanks
-Practical: determining apparent depth using travelling microscope method
-Discussion on viewing angle effects

Calculator
-Charts showing refractive indices
-Worked examples
-Reference tables
-Graph paper
-Different transparent materials
-Speed of light reference chart
Beakers
-Water
-Coins
-Rulers
-Pins
-Travelling microscope (if available)
-Glass blocks
-Colored chalk dust
-Calculator
-Measuring cylinders

KLB Secondary Physics Form 3, Pages 39-43
KLB Secondary Physics Form 3, Pages 44-48

Refraction of Light

Experimental Determination of Refractive Index

By the end of the lesson, the learner should be able to:
Describe methods to determine refractive index experimentally
-Use real and apparent depth method
-Apply pin method for refractive index determination
-Use no-parallax method
-Calculate refractive index from experimental data
-Discuss sources of error and precautions

Q/A on real and apparent depth concepts
-Experiment 1: Real and apparent depth using pins
-Experiment 2: Glass block method using pins
-Experiment 3: No-parallax method with water
-Data collection and analysis
-Plotting graphs where applicable
-Discussion on experimental errors and improvements

Glass blocks
-Pins
-Cork holders
-Beakers
-Water
-Rulers
-White paper
-Clamp and stand
-Graph paper
-Calculator
-Measuring tape

KLB Secondary Physics Form 3, Pages 48-51

Refraction of Light

Experimental Determination of Refractive Index

By the end of the lesson, the learner should be able to:
Describe methods to determine refractive index experimentally
-Use real and apparent depth method
-Apply pin method for refractive index determination
-Use no-parallax method
-Calculate refractive index from experimental data
-Discuss sources of error and precautions

Q/A on real and apparent depth concepts
-Experiment 1: Real and apparent depth using pins
-Experiment 2: Glass block method using pins
-Experiment 3: No-parallax method with water
-Data collection and analysis
-Plotting graphs where applicable
-Discussion on experimental errors and improvements

Glass blocks
-Pins
-Cork holders
-Beakers
-Water
-Rulers
-White paper
-Clamp and stand
-Graph paper
-Calculator
-Measuring tape

KLB Secondary Physics Form 3, Pages 48-51

Refraction of Light

Critical Angle and Total Internal Reflection

By the end of the lesson, the learner should be able to:
Define critical angle
-State conditions for total internal reflection
-Derive relationship between critical angle and refractive index
-Calculate critical angle for different materials
-Explain total internal reflection using ray diagrams

Review experimental methods through Q/A
-Demonstration: increasing angle of incidence in glass-air interface
-Observation of critical angle and total internal reflection
-Derivation of sin c = 1/n relationship
-Worked examples calculating critical angles
-Investigation using semi-circular glass block
-Discussion on applications of total internal reflection

Semi-circular glass block
-Ray box
-White paper
-Protractor
-Pins
-Calculator
-Charts showing TIR
-Water
-Different transparent blocks

KLB Secondary Physics Form 3, Pages 51-55

Refraction of Light

Applications of Total Internal Reflection - Optical Devices
Mirage and Atmospheric Refraction

By the end of the lesson, the learner should be able to:
Explain working of periscope using total internal reflection
-Describe use of prisms in optical instruments
-Understand principle of optical fibers
-Explain advantages of prisms over mirrors
-Analyze light paths in prism binoculars and pentaprism
Explain formation of mirage using refraction principles
-Describe atmospheric refraction effects
-Understand continuous refraction in varying density media
-Explain why sun appears above horizon after sunset
-Discuss polar mirages and their formation

Q/A review on critical angle and TIR
-Demonstration: 45° prisms turning light through 90° and 180°
-Construction of simple periscope model
-Explanation of optical fiber principle
-Discussion on prism binoculars and pentaprism
-Comparison of prisms vs mirrors advantages
-Practical: observing TIR in water-filled apparatus
Review TIR applications through Q/A
-Demonstration of refraction in liquids of different densities
-Explanation of hot air effects on light path
-Discussion on desert mirages and road mirages
-Atmospheric refraction effects on sun position
-Analysis of continuous refraction in varying media
-Drawing ray diagrams for mirage formation

45° prisms
-Periscope model
-Optical fiber samples
-Mirrors for comparison
-Ray box
-Water
-Transparent containers
-Charts showing optical instruments
-Binoculars (if available)
Liquids of different densities
-Transparent containers
-Heat source (safe)
-Charts showing mirage formation
-Diagrams of atmospheric refraction
-Pictures of mirages
-Ray diagrams

KLB Secondary Physics Form 3, Pages 55-58
KLB Secondary Physics Form 3, Pages 55-56

Refraction of Light

Dispersion of White Light

By the end of the lesson, the learner should be able to:
Define dispersion of white light
-Explain why white light splits into colors
-Identify colors of visible spectrum in order
-Understand that different colors have different refractive indices
-Describe formation of rainbow

Q/A on atmospheric effects and TIR
-Experiment: dispersion using triangular prism
-Observation of spectrum formation
-Discussion on why different colors bend differently
-Explanation of rainbow formation
-Identification of ROYGBIV sequence
-Investigation of spectrum using CD/DVD

Triangular glass prism
-White light source
-Screen
-Ray box
-CD/DVD
-White paper
-Ruler
-Charts showing spectrum
-Pictures of rainbows

KLB Secondary Physics Form 3, Pages 58-60

Refraction of Light

Dispersion of White Light

By the end of the lesson, the learner should be able to:
Define dispersion of white light
-Explain why white light splits into colors
-Identify colors of visible spectrum in order
-Understand that different colors have different refractive indices
-Describe formation of rainbow

Q/A on atmospheric effects and TIR
-Experiment: dispersion using triangular prism
-Observation of spectrum formation
-Discussion on why different colors bend differently
-Explanation of rainbow formation
-Identification of ROYGBIV sequence
-Investigation of spectrum using CD/DVD

Triangular glass prism
-White light source
-Screen
-Ray box
-CD/DVD
-White paper
-Ruler
-Charts showing spectrum
-Pictures of rainbows

KLB Secondary Physics Form 3, Pages 58-60

Refraction of Light

Recombination of Spectrum and Problem Solving

By the end of the lesson, the learner should be able to:
Demonstrate recombination of dispersed light
-Explain Newton's disc experiment
-Use concave mirror to recombine spectrum
-Solve complex problems involving refraction
-Apply all refraction concepts to examination-type questions

Review dispersion concepts through Q/A
-Experiment: recombining spectrum using second prism
-Demonstration of Newton's disc
-Using concave mirror to focus spectrum
-Comprehensive problem-solving session covering all topics
-Practice with past examination questions
-Review and consolidation of entire unit

Second triangular prism
-Concave mirror
-Newton's disc
-Motor (for spinning disc)
-Calculator
-Past exam papers
-Comprehensive problem sets
-Review charts
-All previous apparatus for revision

KLB Secondary Physics Form 3, Pages 58-60

Newton's Laws of Motion

Newton's First Law and Inertia
Momentum and its Applications

By the end of the lesson, the learner should be able to:
State Newton's first law of motion
-Define inertia and relate it to mass
-Explain the concept of balanced and unbalanced forces
-Give examples of Newton's first law in daily life
-Understand the need for seat belts and safety devices
Define momentum and state its SI unit
-Calculate momentum using p = mv
-Identify momentum as a vector quantity
-Solve problems involving momentum calculations
-Compare momentum of different objects

Q/A review on forces from previous studies
-Demonstration: cardboard and coin experiment
-Demonstration: hitting bottom coin from stack
-Discussion on inertia and its relationship to mass
-Explanation of seat belts and safety devices in vehicles
-Analysis of forces acting on aircraft in flight
Review Newton's first law through Q/A
-Introduction to momentum concept with examples
-Demonstration: comparing stopping distances of vehicles
-Worked examples on momentum calculations
-Problem-solving session with various scenarios
-Discussion on factors affecting momentum

Cardboard
-Glass tumbler
-Coins
-Charts showing aircraft forces
-Pictures of safety devices
-Demonstration materials
-Balance
Calculator
-Toy cars of different masses
-Stopwatch
-Measuring tape
-Worked examples charts
-Problem worksheets

KLB Secondary Physics Form 3, Pages 65-67
KLB Secondary Physics Form 3, Pages 67-68

Newton's Laws of Motion

Newton's Second Law of Motion

By the end of the lesson, the learner should be able to:
State Newton's second law of motion
-Derive the relationship F = ma
-Define the Newton as unit of force
-Understand rate of change of momentum
-Apply F = ma to solve problems

Q/A on momentum concepts
-Derivation of F = ma from Newton's second law
-Definition of the Newton using F = ma
-Demonstration using ticker-timer and trolley
-Worked examples applying F = ma
-Problem-solving session with force calculations

Ticker-timer
-Trolley
-Runway
-Elastic cords
-Masses
-Calculator
-Force diagrams
-Worked examples

KLB Secondary Physics Form 3, Pages 68-74

Newton's Laws of Motion

Newton's Second Law of Motion

By the end of the lesson, the learner should be able to:
State Newton's second law of motion
-Derive the relationship F = ma
-Define the Newton as unit of force
-Understand rate of change of momentum
-Apply F = ma to solve problems

Q/A on momentum concepts
-Derivation of F = ma from Newton's second law
-Definition of the Newton using F = ma
-Demonstration using ticker-timer and trolley
-Worked examples applying F = ma
-Problem-solving session with force calculations

Ticker-timer
-Trolley
-Runway
-Elastic cords
-Masses
-Calculator
-Force diagrams
-Worked examples

KLB Secondary Physics Form 3, Pages 68-74

Newton's Laws of Motion

Experimental Verification of Newton's Second Law

By the end of the lesson, the learner should be able to:
Investigate relationship between force and acceleration
-Investigate relationship between mass and acceleration
-Verify F = ma experimentally
-Analyze ticker-tape results
-Draw conclusions from experimental data

Review F = ma through Q/A
-Experiment: Force vs acceleration (constant mass)
-Experiment: Mass vs acceleration (constant force)
-Analysis of ticker-tape patterns
-Data collection and graph plotting
-Discussion on experimental errors and improvements

Ticker-timer
-Trolley
-Ticker tape
-Elastic cords
-Various masses
-Scissors
-Graph paper
-Rulers
-Calculator

KLB Secondary Physics Form 3, Pages 69-71

Newton's Laws of Motion

Impulse and Change in Momentum
Newton's Third Law of Motion

By the end of the lesson, the learner should be able to:
Define impulse and state its units
-Understand impulse-momentum theorem
-Calculate impulse using Ft = Δp
-Analyze force-time graphs
-Apply impulse concept to real situations
State Newton's third law of motion
-Understand action and reaction pairs
-Explain that forces occur in pairs
-Apply third law to various situations
-Analyze motion in different scenarios

Q/A review on Newton's second law
-Introduction to impulse concept
-Derivation of impulse-momentum theorem
-Analysis of force-time graphs and area calculation
-Worked examples on impulse calculations
-Discussion on applications: car safety, sports
Review impulse concepts through Q/A
-Demonstration: walking and floor interaction
-Demonstration: jumping from boat scenario
-Discussion on action-reaction pairs
-Examples from daily life: walking, swimming, rocket propulsion
-Problem-solving involving third law

Graph paper
-Force-time graph examples
-Calculator
-Charts showing car safety features
-Sports equipment examples
-Worked examples
Books for pressure demonstration
-Spring balances
-Trolleys
-String
-Charts showing action-reaction examples
-Pictures of rockets and jets

KLB Secondary Physics Form 3, Pages 71-74
KLB Secondary Physics Form 3, Pages 75-80

Newton's Laws of Motion

Applications of Newton's Laws - Lifts and Apparent Weight

By the end of the lesson, the learner should be able to:
Analyze forces in accelerating lifts
-Calculate apparent weight in different situations
-Understand weightlessness concept
-Apply Newton's laws to lift problems
-Solve problems involving vertical motion

Q/A on Newton's third law
-Analysis of forces in lift moving upward with acceleration
-Analysis of forces in lift moving downward with acceleration
-Calculation of apparent weight in different scenarios
-Discussion on weightlessness in spacecraft
-Problem-solving session on lift problems

Spring balance
-Mass
-Lift diagrams
-Calculator
-Free-body diagram charts
-Worked examples
-Problem worksheets

KLB Secondary Physics Form 3, Pages 76-78

Newton's Laws of Motion

Applications of Newton's Laws - Lifts and Apparent Weight

By the end of the lesson, the learner should be able to:
Analyze forces in accelerating lifts
-Calculate apparent weight in different situations
-Understand weightlessness concept
-Apply Newton's laws to lift problems
-Solve problems involving vertical motion

Q/A on Newton's third law
-Analysis of forces in lift moving upward with acceleration
-Analysis of forces in lift moving downward with acceleration
-Calculation of apparent weight in different scenarios
-Discussion on weightlessness in spacecraft
-Problem-solving session on lift problems

Spring balance
-Mass
-Lift diagrams
-Calculator
-Free-body diagram charts
-Worked examples
-Problem worksheets

KLB Secondary Physics Form 3, Pages 76-78

Newton's Laws of Motion

Conservation of Linear Momentum

By the end of the lesson, the learner should be able to:
State the law of conservation of momentum
-Apply conservation of momentum to collisions
-Distinguish between elastic and inelastic collisions
-Solve collision problems
-Understand momentum in explosions

Review lift problems through Q/A
-Statement and explanation of conservation of momentum
-Demonstration: colliding trolleys or balls
-Analysis of elastic and inelastic collisions
-Worked examples on collision problems
-Discussion on explosions and momentum conservation

Trolleys
-Plasticine
-Marbles
-Spring balance
-Measuring tape
-Stopwatch
-Calculator
-Collision demonstration apparatus

KLB Secondary Physics Form 3, Pages 80-86

Newton's Laws of Motion

Applications of Momentum Conservation - Rockets and Jets
Friction - Types and Laws

By the end of the lesson, the learner should be able to:
Explain rocket and jet propulsion
-Apply momentum conservation to propulsion systems
-Understand recoil velocity calculations
-Analyze garden sprinkler operation
-Solve recoil problems
Define friction and explain its molecular basis
-Distinguish between static and kinetic friction
-State and apply laws of friction
-Understand advantages and disadvantages of friction
-Identify methods of reducing friction

Q/A review on momentum conservation
-Explanation of rocket propulsion principle
-Analysis of jet engine operation
-Calculation of recoil velocities
-Demonstration: balloon rocket or garden sprinkler
-Problem-solving on recoil scenarios
Review momentum applications through Q/A
-Demonstration: block on table with increasing force
-Explanation of molecular basis of friction
-Discussion on types of friction: static, kinetic, rolling
-Investigation of factors affecting friction
-Examples of friction in daily life and technology

Balloons
-String
-Straws
-Garden sprinkler (if available)
-Charts showing rocket/jet engines
-Calculator
-Worked examples
Wooden blocks
-Different surfaces
-Spring balance
-Weights
-Lubricants
-Sandpaper
-Charts showing friction applications
-Ball bearings

KLB Secondary Physics Form 3, Pages 86-87
KLB Secondary Physics Form 3, Pages 87-90

Newton's Laws of Motion

Viscosity and Terminal Velocity

By the end of the lesson, the learner should be able to:
Define viscosity and explain its effects
-Understand motion of objects through fluids
-Explain terminal velocity concept
-Analyze forces on falling objects in fluids
-Investigate factors affecting terminal velocity

Q/A on friction concepts
-Demonstration: steel ball falling through different liquids
-Explanation of viscous drag and terminal velocity
-Analysis of forces: weight, upthrust, and viscous drag
-Investigation of terminal velocity using glycerine
-Discussion on applications: parachutes, rain drops

Tall measuring cylinder
-Glycerine
-Steel ball bearings
-Water
-Stopwatch
-Rubber bands
-Ruler
-Different viscous liquids

KLB Secondary Physics Form 3, Pages 90-93

Newton's Laws of Motion

Viscosity and Terminal Velocity

By the end of the lesson, the learner should be able to:
Define viscosity and explain its effects
-Understand motion of objects through fluids
-Explain terminal velocity concept
-Analyze forces on falling objects in fluids
-Investigate factors affecting terminal velocity

Q/A on friction concepts
-Demonstration: steel ball falling through different liquids
-Explanation of viscous drag and terminal velocity
-Analysis of forces: weight, upthrust, and viscous drag
-Investigation of terminal velocity using glycerine
-Discussion on applications: parachutes, rain drops

Tall measuring cylinder
-Glycerine
-Steel ball bearings
-Water
-Stopwatch
-Rubber bands
-Ruler
-Different viscous liquids

KLB Secondary Physics Form 3, Pages 90-93

Work, Energy, Power and Machines

Gears and Hydraulic Systems

By the end of the lesson, the learner should be able to:
Understand gear systems and their operation
-Calculate V.R. for gear systems
-Explain hydraulic lift principle
-Apply Pascal's principle to hydraulic systems
-Calculate M.A. and V.R. for hydraulic systems

Review inclined planes through Q/A
-Demonstration: gear system operation
-Calculation of gear ratios and V.R.
-Explanation of hydraulic lift principle
-Demonstration: Pascal's principle using syringes
-Calculation of hydraulic system parameters

Gear wheels
-Bicycle for gear demonstration
-Syringes of different sizes
-Water
-Tubes
-Calculator
-Hydraulic system diagrams
-Gear ratio charts

KLB Secondary Physics Form 3, Pages 116-119

Work, Energy, Power and Machines
Current Electricity (II)

Efficiency of Machines
Electric Current and Measurement

By the end of the lesson, the learner should be able to:
Understand factors affecting machine efficiency
-Calculate efficiency using different methods
-Investigate efficiency of various machines
-Understand energy losses in machines
-Discuss methods to improve efficiency
Define electric current and state its SI unit
-Understand conventional current flow
-Use ammeters correctly to measure current
-Read ammeter scales accurately
-Understand current as rate of flow of charge

Q/A on gears and hydraulic systems
-Investigation: efficiency of pulley system
-Discussion on factors causing energy losses
-Measurement of input and output work
-Calculation of efficiency for different machines
-Discussion on improving machine efficiency
Q/A review on basic electricity from Form 2
-Definition of electric current and conventional flow
-Demonstration: proper ammeter connection in series
-Practice reading different ammeter scales
-Discussion on digital vs analogue meters
-Safety precautions when using electrical equipment

Various machines for testing
-Spring balances
-Measuring tape
-Stopwatch
-Calculator
-Efficiency measurement setup
-Lubricants for demonstration
Ammeters (analogue and digital)
-Dry cells
-Connecting wires
-Bulbs
-Switches
-Ammeter scale charts
-Safety equipment

KLB Secondary Physics Form 3, Pages 120-123
KLB Secondary Physics Form 3, Pages 126-130

Current Electricity (II)

Series and Parallel Circuits - Current Distribution

By the end of the lesson, the learner should be able to:
Investigate current in series circuits
-Investigate current in parallel circuits
-Apply Kirchhoff's current law
-Understand current division in parallel circuits
-Solve problems involving current distribution

Review ammeter usage through Q/A
-Experiment: measuring current in series circuit
-Experiment: measuring current in parallel circuit
-Analysis of current readings and patterns
-Statement of Kirchhoff's current law
-Problem-solving on current distribution

Multiple ammeters
-Bulbs
-Connecting wires
-Dry cells
-Switches
-Circuit boards
-Calculator
-Current distribution worksheets

KLB Secondary Physics Form 3, Pages 130-133

Current Electricity (II)

Series and Parallel Circuits - Current Distribution

By the end of the lesson, the learner should be able to:
Investigate current in series circuits
-Investigate current in parallel circuits
-Apply Kirchhoff's current law
-Understand current division in parallel circuits
-Solve problems involving current distribution

Review ammeter usage through Q/A
-Experiment: measuring current in series circuit
-Experiment: measuring current in parallel circuit
-Analysis of current readings and patterns
-Statement of Kirchhoff's current law
-Problem-solving on current distribution

Multiple ammeters
-Bulbs
-Connecting wires
-Dry cells
-Switches
-Circuit boards
-Calculator
-Current distribution worksheets

KLB Secondary Physics Form 3, Pages 130-133

Current Electricity (II)

Potential Difference and Voltage Measurement

By the end of the lesson, the learner should be able to:
Define potential difference in terms of work done
-State the SI unit of potential difference
-Use voltmeters correctly to measure voltage
-Understand voltage measurement across components
-Read voltmeter scales accurately

Q/A on current distribution
-Definition of potential difference and work done per unit charge
-Demonstration: proper voltmeter connection in parallel
-Practice measuring voltage across different components
-Comparison of voltmeter and ammeter connections
-Safety considerations in voltage measurement

Voltmeters (analogue and digital)
-Dry cells
-Resistors
-Bulbs
-Connecting wires
-Switches
-Voltmeter scale charts
-Work and charge demonstration materials

KLB Secondary Physics Form 3, Pages 126-129

Current Electricity (II)

Series and Parallel Circuits - Voltage Distribution

By the end of the lesson, the learner should be able to:
Investigate voltage in series circuits
-Investigate voltage in parallel circuits
-Apply Kirchhoff's voltage law
-Understand voltage division in series circuits
-Solve problems involving voltage distribution

Review voltage measurement through Q/A
-Experiment: measuring voltage across series components
-Experiment: measuring voltage across parallel components
-Analysis of voltage readings and patterns
-Statement of Kirchhoff's voltage law
-Problem-solving on voltage distribution

Multiple voltmeters
-Various resistors
-Connecting wires
-Dry cells
-Switches
-Circuit boards
-Calculator
-Voltage distribution worksheets

KLB Secondary Physics Form 3, Pages 130-133

Current Electricity (II)

Ohm's Law - Investigation and Verification

By the end of the lesson, the learner should be able to:
State Ohm's law
-Investigate relationship between voltage and current
-Plot V-I graphs for ohmic conductors
-Verify Ohm's law experimentally
-Understand conditions for Ohm's law validity

Q/A on voltage distribution
-Experiment: varying voltage and measuring current through resistor
-Data collection and table completion
-Plotting V-I graph and analyzing slope
-Statement and verification of Ohm's law
-Discussion on temperature and other conditions

Rheostat
-Ammeter
-Voltmeter
-Resistor coils
-Connecting wires
-Dry cells
-Graph paper
-Calculator
-Ruler

KLB Secondary Physics Form 3, Pages 131-135

Current Electricity (II)

Electrical Resistance and Ohm's Law Applications

By the end of the lesson, the learner should be able to:
Define electrical resistance and its SI unit
-Apply Ohm's law to calculate V, I, and R
-Understand the relationship R = V/I
-Solve problems using Ohm's law
-Convert between different units of resistance

Review Ohm's law investigation through Q/A
-Definition of electrical resistance as V/I ratio
-Worked examples applying Ohm's law triangle
-Unit conversions: Ω, kΩ, MΩ
-Problem-solving session on Ohm's law calculations
-Discussion on factors affecting resistance

Calculator
-Ohm's law triangle charts
-Resistor color code charts
-Various resistors
-Multimeter
-Problem worksheets
-Unit conversion charts

KLB Secondary Physics Form 3, Pages 131-135

Current Electricity (II)

Ohmic and Non-Ohmic Conductors

By the end of the lesson, the learner should be able to:
Distinguish between ohmic and non-ohmic conductors
-Investigate V-I characteristics of different materials
-Understand why some materials don't obey Ohm's law
-Analyze V-I graphs for various conductors
-Identify practical applications of non-ohmic conductors

Q/A on Ohm's law applications
-Experiment: V-I characteristics of filament bulb
-Experiment: V-I characteristics of diode
-Comparison of different V-I graph shapes
-Discussion on temperature effects on resistance
-Applications of non-ohmic conductors

Filament bulbs
-Diodes
-Thermistors
-LDR
-Ammeter
-Voltmeter
-Rheostat
-Graph paper
-Various conductors for testing

KLB Secondary Physics Form 3, Pages 134-135

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)

Types of Resistors and Their Applications
Measurement of Resistance - Voltmeter-Ammeter Method

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
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

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
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

Various resistor types
-Color code charts
-Rheostat
-Potentiometer
-Thermistor
-LDR
-Multimeter
-Circuit boards
-Application examples
Unknown resistors
-Voltmeter
-Ammeter
-Rheostat
-Connecting wires
-Dry cells
-Switches
-Calculator
-Multimeter for comparison

KLB Secondary Physics Form 3, Pages 135-140
KLB Secondary Physics Form 3, Pages 140-142

Current Electricity (II)

Wheatstone Bridge Method

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

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

Wheatstone bridge apparatus
-Galvanometer
-Known resistors
-Unknown resistors
-Connecting wires
-Battery
-Calculator
-Bridge equation charts

KLB Secondary Physics Form 3, Pages 142-144

Current Electricity (II)

Resistors in Series - Theory and Calculations

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

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

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

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)

Resistors in Parallel - Theory and Calculations
Mixed Circuits - Series-Parallel Combinations

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
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

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
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

Resistors of known values
-Multimeter
-Connecting wires
-Circuit boards
-Calculator
-Parallel circuit diagrams
-Problem worksheets
Various resistors
-Circuit boards
-Connecting wires
-Multimeter
-Calculator
-Complex circuit diagrams
-Step-by-step analysis charts

KLB Secondary Physics Form 3, Pages 147-150
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

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

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

Various cells
-Resistors of different values
-Voltmeter
-Ammeter
-Connecting wires
-Graph paper
-Calculator
-Internal resistance apparatus

KLB Secondary Physics Form 3, Pages 150-153

Current Electricity (II)

Cells in Series and Parallel

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

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

Multiple identical cells
-Connecting wires
-Voltmeter
-Ammeter
-Resistors
-Calculator
-Cell combination diagrams
-Problem worksheets

KLB Secondary Physics Form 3, Pages 152-153

Current Electricity (II)

Cells in Series and Parallel
Advanced Circuit Analysis and Problem Solving

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

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
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

Multiple identical cells
-Connecting wires
-Voltmeter
-Ammeter
-Resistors
-Calculator
-Cell combination diagrams
-Problem worksheets
Complex circuit examples
-Calculator
-Circuit analysis worksheets
-Multiple EMF sources
-Various resistors
-Comprehensive problem sets
-Kirchhoff's law charts

KLB Secondary Physics Form 3, Pages 152-153
KLB Secondary Physics Form 3, Pages 126-153