What is the definition of alternating potential difference?

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4456
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GCSE physcis
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Joinedup
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any situation where the pd between conductors changes between positive and negative repeatedly over time.

So its different from DC where one conductor is always more positive than the other.

The most usual frequency for AC power is 50Hz in the UK though it could be 60Hz in some other countries. Aircraft sometimes run on 300Hz power afaik and theres some electrified railways running at 16Hz
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James20482
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Alternating vs direct potential differences explain the type of current they lead to, alternating and direct currents respectively. An alternating current changes direction constantly, which means that the current in the wire will flow in one direction and then decide to reverse and flow in the other direction instead. The current is constantly alternating between positive and negative. The difference between that and a direct current is that a direct current does not change which simply means it never reverses.

All exam boards will accept the following answer on an exam:
"Flow of electric charge that periodically reverses over time"
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Thank you
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