Impedance

In electrical and electronic circuits, when a sine wave AC voltage is applied, the sum of the resistance (R), inductance (L), and capacitance (C), expressed as impedance Z, and the angular frequency of the AC voltage as ω, is represented by the following formula:

Z = R + jωL + 1/jωC

In AC circuits, when a voltage is applied, the magnitude and phase of the current, as well as the power and power factor, are determined by the value of impedance. Note that admittance is the reciprocal of impedance.