= AC =

Ac or alternating current is  type of power delivery via electricty in which
the voltage is oscilated, usually using some form of sin wave.

== Power delivery ==

Power delivery is difficult to calculate for AC in comparison to DC. For DC,
the power delivery is calculated via

`P = E^2 / R`

For AC, however, we substitute E with the root mean square (RMS)

=== RMS ===

The RMS can be any value for different waves, however for the most common type
of wave, the sin wave, we can simply *multiply the peak voltage by 0.707*.
For example

Sin wave with a peak voltage of 17V has an RMS of 0.717 * 17 = 12V

To convert from the Power delivery of an AC line back to the peak power, simply
multiply the value by 1.414. For example

A 120V AC power line has a peak voltage of 120 * 1.414 = 169.7V