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
The National Grid
- 3 things to know
- Physics Paper 1
Overview
The National Grid as a system of cables and transformers, step-up and step-down transformers and why both are needed, energy wasted by the current heating transmission cables, and why transmitting at a high potential difference and low current makes the grid efficient.
What you need to know
Answer each one before you reveal it.
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Key term
What is the National Grid?
Key term
Name the two kinds of component that make up the National Grid.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is the National Grid?
Model answer
A nationwide system of cables and transformers that links power stations to consumers.
- 2
What is transferred from power stations to homes and factories by the National Grid?
Model answer
Electrical power.
- 3
Name the two kinds of component that make up the National Grid.
Model answer
Cables and transformers.
- 4
What type of transformer is used between a power station and the transmission cables?
Model answer
A step-up transformer.
- 5
What does a step-up transformer do to the potential difference?
Model answer
It increases it.
- 6
What type of transformer is used before electricity reaches homes, and what does it do?
Model answer
A step-down transformer, which decreases the potential difference to a much lower value for domestic use.
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