Sinusoidal Waveforms

$v(t) = V_m \sin(\omega t + \phi) \qquad \omega = 2\pi f \qquad T = \frac{1}{f}$

Quantity	Sine wave value
Peak	$V_m$
Peak-to-peak	$2V_m$
RMS	$V_m/\sqrt{2} \approx 0.707V_m$
Average (half cycle)	$2V_m/\pi \approx 0.637V_m$
Form factor	RMS/average ≈ 1.11
Crest factor	peak/RMS ≈ 1.414

The RMS value delivers the same heating power as that DC value. Indian mains is 230 V RMS, so its peak is about 325 V.