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

0 2 Views | Posted 4 months ago
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  • 1 Answer

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    Answered by

    Payal Gupta | Contributor-Level 10

    4 months ago

    This is a short answer type question as classified in NCERT Exemplar

    For a Direct Current (DC),

    1ampere= 1coulomb/sec

    An AC current changes direction with the source frequency and the attractive force would average to zero. Thus, the AC ampere must be defined in terms of some property that is independent of the direction of current.

    Joule’s heating effect is such property and hence it is used to define rms value of AC.

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