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AC Circuit Equations

Inductive Reactance


Capacitive Reactance


Impedance in Relation to R and X

Ohm's Law for AC


E = Voltage in volts

I = Current in amperes (amps)

Z = Impedance in ohms

Series and Parallel Impedances

NOTE: All impedances must be calculated in complex number form for these equations to work.


NOTE: This equation applies to a non-resistive LC circuit. In circuits containing resistance as well as inductance and capacitance, this equation applies only to series configurations and to parallel configurations where R is very small.

AC Power

Lessons In Electric Circuits copyright (C) 2000-2020 Tony R. Kuphaldt, under the terms and conditions of the CC BY License.

See the Design Science License (Appendix 3) for details regarding copying and distribution.

Revised July 25, 2007

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