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
Direct and alternating potential difference, and mains electricity
- 3 things to know
- Physics Paper 1
Overview
Mains electricity as an alternating supply at 50 Hz and about 230 V, direct and alternating potential difference, the three-core cable with its colour-coded live, neutral and earth wires, the job and potential of each wire, and why the live wire is dangerous even when a switch is open.
What you need to know
Answer each one before you reveal it.
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Key term
Is mains electricity a direct supply or an alternating supply?
Key term
What does a frequency of 50 Hz mean for the mains supply?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Is mains electricity a direct supply or an alternating supply?
Model answer
An alternating supply.
- 2
What is the frequency of the domestic electricity supply in the United Kingdom?
Model answer
50 Hz.
- 3
What is the potential difference of the domestic electricity supply in the United Kingdom?
Model answer
About 230 V.
- 4
What does a frequency of 50 Hz mean for the mains supply?
Model answer
The supply goes through fifty complete cycles each second, reversing its direction a hundred times.
- 5
What is a direct potential difference?
Model answer
One that is always in the same direction, so the current it drives flows one way only.
- 6
What is an alternating potential difference?
Model answer
One that repeatedly changes direction, so the current it drives flows first one way and then the other.
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