ALTERNATING CURRENT AND DIRECT CURRENT

1 mark · Normal

Which of the following best describes alternating current (a.c.) as opposed to direct current (d.c.)?

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Correct option: A current that regularly reverses direction and changes size with time.

Common mistakes: Confusing d.c. with a.c. properties

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Marking points

B1 · 1 mark · Correct option selected: 'A current that regularly reverses direction and changes size with time.'

Worked solution

Alternating current changes direction and size with time; this is the key difference from d.c., which is constant and one-directional.