Answer Posted / c.haribalakrishnan

Form factor of an alternating current waveform (signal) is
the ratio of the RMS (Root Mean Square) value to the
Absolute Average Value (also referred to as the Practical
Average Value) of the waveform.In the case of a sinusoidal
wave ie., an analogue wave, the form factor is
approximately 1.11. In the case of a square wave ie., a
digital wave, the RMS and the average values are equal;
therefore, the form factor is 1.

That is why generation,transmission Volatges is
proportional to 11...

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