why should we use voltage rms (V rms) besides peak voltage (V peak) for main supply? What is the different that might be occur?
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1$\begingroup$ Would Electrical Engineering be a better home for this question? $\endgroup$ – Qmechanic♦ Oct 2 '16 at 14:21
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Simplicity: The rms voltage multiplied by the rms current is the power. Also rms voltage and current definitions allow for deviations from pure sinusoid time dependences.
