Key term
AQA GCSE Combined Science Physics 8464
Atomic Structure
Topic overviewThe structure of an atomMass number, atomic number and isotopesFrom the plum pudding model to the nuclear modelChadwick, the neutron, and comparing the modelsRadioactive decay and nuclear radiationNuclear equationsHalf-lives and the random nature of radioactive decayRadioactive contamination
Electricity
Topic overviewCircuit symbols, electrical charge and currentCurrent, resistance and potential differenceOhmic conductors, filament lamps, diodes and thermistorsLight-dependent resistors, and investigating resistanceCurrent and potential difference in series and parallelConstructing circuits, and calculating in series circuitsDirect and alternating potential difference, and mains electricityPower and efficiencyAppliances, and the energy transferred by electrical workPower, and the power ratings of domestic appliancesThe National Grid
Energy
Forces
Topic overviewScalars, vectors, forces and the resultant forceGravityWork done and energy transferStretching, compressing, and the spring constantLinear and non-linear extension, and work done on a springResolving forces and free body diagramsDistance, displacement and speedThe speed of sound, and the distance-speed-time equationVelocity and the distance-time relationshipAcceleration, deceleration and velocity-time graphsArea under a velocity-time graph, and the uniform acceleration equationNewton's First LawNewton's Second and Third LawsStopping distance and reaction timeFactors affecting braking distanceBraking force, deceleration and the dangers of stopping quicklyMomentum and its conservation
Magnetism and Electromagnetism
Particle Model of Matter
Electricity
Light-dependent resistors, and investigating resistance
- 3 things to know
- Physics Paper 1
Overview
How the resistance of a light-dependent resistor changes with brightness and where that is used, then the circuit, meters and variable resistor for measuring resistance and plotting current against potential difference.
What you need to know
Answer each one before you reveal it.
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Key term
Explain how a light-dependent resistor can switch a street lamp on at dusk.
Key term
Suggest one use for a light-dependent resistor other than a street light.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What happens to the resistance of a light-dependent resistor as the light falling on it gets brighter?
Model answer
It decreases.
- 2
What happens to the resistance of a light-dependent resistor in darkness?
Model answer
It becomes very high.
- 3
A lamp is moved closer and closer to a light-dependent resistor in a circuit. Describe how the current changes.
Model answer
The current increases, because the brighter light lowers the resistance of the light-dependent resistor.
- 4
Give one use of a light-dependent resistor in a circuit.
Model answer
Switching a street light on automatically when it gets dark.
- 5
Explain how a light-dependent resistor can switch a street lamp on at dusk.
Model answer
As daylight fades the resistance of the light-dependent resistor rises, and the circuit responds to that change by closing the switch that turns the lamp on.
- 6
Suggest one use for a light-dependent resistor other than a street light.
Model answer
Controlling the exposure in a camera, or triggering an alarm when a light beam is broken.
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