question_answer 47)

    Both alternating current and direct current are measured in amperes. But how is the ampere defined for an alternating current?

Answer:

                  In direct current, 1 ampere = 1 coulomb/sec. However, in alternating current, direction of current is reversed every half cycle. Therefore, a.c. ampere is defined in terms of some property, which is independent of direction of current. As is known, a.c. ampere is defined in terms of Joule's heating, which is proportional to .