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It comes in terms form factor. The relation for Vrms and Vavg will be different for different waveforms. One can calculate the values and find the form factor.
nishant22,
RMS voltage for a given waveform is the voltage that produces the same heating effect in a resistive load as a DC voltage with the same value. As subharpe mentioned, its relationship to the average value depends on the waveform. For example, for a sine wave, the RMS voltage is approximately 1.1 X the average value and is equal to .707 X the peak value. For a symmetrical square wave, the peak, average and RMS values are equal.
Regards,
Kral
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