Process
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
Magnetism and Electromagnetism
Transformer power, and using the transformer equations
- 3 things to know
- Physics Paper 2
Overview
The power equation for a transformer that wastes no energy, which coil's potential difference and current give the input and output power, the unit of power, what happens to the current when the potential difference is stepped up, and calculations of input current and transmission line current.
What you need to know
Answer each one before you reveal it.
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Process
Which coil's potential difference and current give the power input of a transformer?
Process
In what unit are the input and output powers of a transformer measured?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Write the equation linking the potential differences and currents in the two coils of a transformer that wastes no energy.
Model answer
Vs × Is = Vp × Ip, where p labels the primary coil and s the secondary coil.
- 2
What does the potential difference across a transformer coil multiplied by the current in it tell you?
Model answer
The electrical power transferred by that coil.
- 3
Which coil's potential difference and current give the power output of a transformer?
Model answer
The secondary coil's.
- 4
Which coil's potential difference and current give the power input of a transformer?
Model answer
The primary coil's.
- 5
A transformer draws a current of 2.0 A from a 230 V supply. Calculate the power input.
Model answer
Power input = 230 × 2.0 = 460 W.
- 6
In what unit are the input and output powers of a transformer measured?
Model answer
In watts, W.
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