Both alternating current and direct current


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


The ampere for an alternating current is defined in terms of the property known as Joule’s law of heating. According to Joule’s law of heating, AC is the current which is

produced in the conductor when heat per second in the conductor is as direct current can produce in one-ohm resistance.

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