Computes the three power components for any common AC or DC electrical system. The power factor (cos φ) defaults to 0.85, typical for inductive loads like motors and transformers. Set it to 1 for resistive loads (heaters, lighting).
Power Calculator (DC / AC mono / AC tri)
Compute active power P (W), reactive power Q (var), apparent power S (VA) for DC, single-phase AC and three-phase AC systems.
Active power (P) (W) —
Reactive power (Q) (var) —
Apparent power (S) (VA) —
Formula
DC : P = U · I
AC mono : P = U · I · cos φ ; Q = U · I · sin φ ; S = U · I
AC tri (line) : P = √3 · U · I · cos φ ; Q = √3 · U · I · sin φ ; S = √3 · U · I