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 springDistance, 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 quickly
Magnetism and Electromagnetism
Particle Model of Matter
Electricity
Power, and the power ratings of domestic appliances
- 3 things to know
- Physics Paper 1
Overview
The units of energy, power, time, charge and potential difference in energy calculations, what the power of a circuit device means and how it relates to potential difference, current and energy transferred per second, power ratings on domestic appliances, and comparing the energy transferred by appliances of different power.
What you need to know
Answer each one before you reveal it.
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Key term
What is the unit of power, and which symbol represents the quantity itself?
Key term
What is meant by the power of a circuit device?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is the unit of energy transferred and its symbol?
Model answer
The joule, J.
- 2
What is the unit of power, and which symbol represents the quantity itself?
Model answer
Power is measured in watts, W, and the quantity is given the symbol P.
- 3
When energy transferred is calculated from power and time, in what unit must the time be given?
Model answer
In seconds, s.
- 4
An appliance runs for 3 minutes. What value of time should be used to calculate the energy transferred in joules?
Model answer
180 s.
- 5
In what unit is charge flow given when the energy transferred is calculated from charge and potential difference?
Model answer
In coulombs, C.
- 6
In what unit is potential difference given when the energy transferred is calculated from charge and potential difference?
Model answer
In volts, V.
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