- direct current (d.c) flows in one direction only, alternating current (a.c) repeatedly reverses its direction of flow
- a mains circuit has a live wire which is alternately positive and negative every cycle, and a neutral wire at 0 volts
- the peak potential difference of an a.c. supply is the maximum voltage measured from 0 volts
- to measure the frequency of an a.c. supply, measure the time period of the waves, then use the equation:
frequency = 1 / time taken for 1 cycle
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