In mathematics, the root mean square (abbreviated RMS or rms), also known as the quadratic mean, is a statistical
measure of the magnitude of a varying quantity. It is especially useful when variates are positive and negative,
e.g., sinusoids. It can be calculated for a series of discrete values or for a continuously varying function. The
name comes from the fact that it is the square root of the mean of the squares of the values.
 Wikipedia
General Equation for RMS Voltage:
RMS (effective) value of any
periodic function with period T.
Average of
Instantaneous Power:
RMS Equation for a Sine Wave:
, ...for positive or negative halfcycle
