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GCSE Physics · key term
A potential difference with a fixed polarity, so it acts in one direction only.
Used by AQA
Specification 4.2.3.1 · Paper 1
Revise: Direct and alternating potential differenceA direct potential difference has a fixed polarity: the same terminal remains positive relative to the other terminal. It therefore acts in one direction only. Cells and batteries provide a direct supply, often abbreviated to d.c.
Use potential difference (or voltage), rather than describing only the current: direct potential difference keeps the same polarity, whereas alternating potential difference repeatedly reverses polarity.
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