February 15, 2017

Why are alternating voltages and currents expressed in r.m.s values and not average values?

An alternating current and voltage varies from instant to instant. The average value cannot be used to specify an alternating voltage or current because it is zero over one cycle. The obvious choice would be to define an alternating currents in terms of the average power which it may cause.

Consider an alternating current, i=imsin


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