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This lesson covers the domestic uses of electricity, including alternating and direct current, the structure of a three-pin plug, the function of the earth wire and fuses, and the role of circuit breakers. This is part of the AQA GCSE Physics specification (4.2.2).
There are two types of electric current:
Direct current always flows in the same direction. The current has a constant value (for a steady d.c. supply).
Sources of d.c.:
Alternating current continuously changes direction. The current repeatedly reverses — it flows one way, then the other way, in a regular cycle.
Sources of a.c.:
The UK mains electricity supply is:
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