Impedance

In electric and electronic circuits, when a sinusoidal AC voltage is applied, the total of resistance (R), inductance (L), and capacitance (C) is expressed by the following formula, where the value of impedance is Z and the angular velocity of the AC voltage is ω.

Z=R+jωL+1/jwC

In an AC circuit, when voltage is applied, the magnitude and phase of the current, as well as the magnitude of the power and the power factor, are determined by the value of the impedance. Admittance is the reciprocal of impedance.