Impedance

In electrical and electronic circuits, when a sinusoidal AC voltage is applied, the sum 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 a 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 impedance. Admittance is the reciprocal of impedance.