Alternating current and direct current

1 mark · Normal

Which device provides direct current (d.c.) only?

ACar batteryBHousehold mains supplyCWind turbine generatorDTransformer

› Show answer

Correct option: Car battery

Common mistakes: Choosing transformer or mains

› Show mark scheme and worked solution

Marking points

B1 · 1 mark · Correct option: Car battery

Worked solution

A car battery is a chemical source that provides d.c., while the others provide or use a.c.

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