# AC Peak Voltage

The peak voltage of an alternating current is the maximum or minimum voltage of a sinusoidal wave. Rather than using instantaneous power, it is more practical to use a time averaged power (where the averaging is performed over any integer number of cycles). Therefore, AC voltage is often expressed as a root mean square (RMS) value.

$V_{peak}=sqrt{2}V_{rms}$

$V_{rms}=frac{V_{peak}}{sqrt{2}}$