# AC Power

## Description

In alternating current circuits, energy storage elements such as inductance and capacitance may result in periodic reversals of the direction of energy flow. The portion of power flow that, averaged over a complete cycle of the AC waveform, results in net transfer of energy in one direction is known as real power (also referred to as active power). That portion of power flow due to stored energy, that returns to the source in each cycle, is known as reactive power. The real power P in watts consumed by a device is depended on the root mean sqare voltage and current and the phase angle between the current and voltage sine waves.

Related formulas## Variables

P | AC Power (W) |

V_{rms} | The root mean sqare voltage (V) |

I_{rms} | The root mean sqare current (A) |

θ | The phase angle (radians) |