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
Current and potential difference in series and parallel
- 3 things to know
- Physics Paper 1
Overview
The two ways of joining components and how to identify series and parallel circuits, how current and potential difference are shared in each, adding resistances in series with calculations, the total current drawn by a parallel circuit, and why resistors in parallel have a total resistance smaller than the smallest of them.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Numbers
A 4 Ω resistor and a 6 Ω resistor are joined in series. Calculate the total resistance.
Key term
Write in symbols the rule for the total resistance of two resistors in series, and give the unit.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What are the two ways of joining electrical components in a circuit?
Model answer
In series and in parallel.
- 2
What is meant by components being connected in series?
Model answer
They are joined one after another in a single loop, so the same current passes through each of them.
- 3
What is meant by components being connected in parallel?
Model answer
They are joined side by side on separate branches, so the charge has more than one path it can follow.
- 4
Can one circuit contain both series and parallel parts?
Model answer
Yes, many circuits have some components in series with a section that is wired in parallel.
- 5
A circuit contains one cell and three lamps joined one after another in a single loop. How are the lamps connected?
Model answer
In series.
- 6
How does the current through each component in a series circuit compare?
Model answer
The current is the same through every component.
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