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GCSE Combined Science · key term
The rate of flow of electric charge, measured in amperes (A).
Used by AQA and Edexcel
Specification 6.2.1.3, 6.2.2, 6.2.4.1 · Paper 5, Paper 6
The rate of flow of electrical charge past a point in a circuit, measured in amperes (A).
Revise: Current, Potential Difference and ResistanceTo understand what determines the current through a component, we need to distinguish current, potential difference and resistance.
Paper 5, Paper 6
Revise: Circuit calculations and component investigationsThe same current passes through every component because there is no junction at which it can divide. Potential difference tells us how much energy is transferred per coulomb of charge. The supply potential difference is shared between the components, so their potential differences add up to the supply value.
Use potential difference across a component and current through it. AQA questions use ‘potential difference’, but correct use of ‘voltage’ also gains credit.
When explaining how resistance affects current, state that the potential difference is kept constant.
Show the equation, substitution and answer with its unit. Use V for potential difference, A for current and Ω for resistance.
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