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GCSE Physics · key term
A potential difference whose polarity repeatedly reverses, usually while its magnitude also varies.
Used by AQA
Specification 4.2.3.1 · Paper 1
Revise: Direct and alternating potential differenceAn alternating potential difference, or a.c., repeatedly reverses polarity. Each terminal becomes alternately positive and negative relative to the other. Its magnitude normally changes as it does so.
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.
Remember both UK mains values together: a.c., 50 Hz, about 230 V.
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