# Complex power

Power in an electric circuit is the rate of flow of energy past a given point of the circuit. The formula for Complex Power (units: VA) in phasor form is: S = V I . BufretLignendeOversett denne sidenIn the last article we discussed the basics of Electrical Power and related terminologies.

Here we will develop the concept of Complex Power and Power Triangle . Example of computing complex power and using it to find average power, reactive power, and the power. Apparent power is a function of a circuit’s total impedance (Z). Since we’re dealing with scalar quantities for power calculation, any complex starting quantities .

Some Equations Useful in AC Power Calculations. Notation: All bold-face letters represent complex numbers. This definition of instantaneous power is valid for signals of any waveform.

A complex number may be taken to the power of another complex number. An explicit example of complex exponentiation is given by . Learn about the different power types, everything you wanted to know on Real, Reactive, Complex and Apparent Power at . Complex conjugate of current phasor is used because for S you need .