significance of rms
smartshashi,
The RMS value is the voltage in a purely resistive load that results in the same power (Heating effect) as a DC voltage of the same value. For example, a sine wave with a peak voltage of 1.0V. produces the same power into a resistive load as a DC voltage of (SQRT(2))/2 volts. So the RMS vlaue of this AC voltage is (SQRT(2)/2 volts = .707106..... The average value of the same AC waveform is [2/PI] = .6366..., which is less than the RMS value.
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For a square wave, the peak, average and RMS values are equal.
Regards,
Kral