AS AQA Phys Unit 1 Current/P.D. Definitions


Current, I (A)

Current is the rate of flow of charge measured in amperes.

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Coulomb (C)

The amount of charge that passes in one second when the current is one ampere.

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Potential difference (voltage)

The energy converted per unit charge moved. 1 volt is equal to 1 joule of energy moving 1 coulomb of charge through a component.

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Ohms law

Provided temperature is constant, the current through an ohmic conductor is directly proportional to the potential difference across it.

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Work done = efficiency (as decimal) * electrical energy input


Electrical energy input = work done / efficiency

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