0.707 x Peak - RMS formula =, 0.637 x Peak - Average formula =, 50 Hz - Mains frequency, 230V - Single phase domestic supply(mains voltage), Definition of Root Mean Square (RMS) - A value that is equivalent to a DC supply or the useful part of a sinusoidal wave form, F = 1/t - Frequency formula, T = 1/f - Periodic Time formula,

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