Calculator · Electrical Engineering
Single-Phase AC Power Calculator
A sinusoidal load draws apparent power S = V·I; only P = S·PF is real power, while Q stores and returns energy each cycle. Lagging means inductive (Q > 0), leading means capacitive (Q < 0).
Inputs
Results
Apparent power S
2.3 kVA
Real power P
1.84 kW
Reactive power Q
1.38 kvar
| Phase angle φ | 36.87° |
|---|---|
| Nature | Lagging (inductive, Q > 0) |
Explore in the Lab
Open this load in the Power & Three-Phase Lab
Carries V, I, PF and the lagging/leading nature.
Technical reference
S = V_rms · I_rms
P = S · PF
Q = ±S · √(1 − PF²) (+ lagging, − leading)
φ = acos(PF)
- V_rms
- RMS voltage (≥ 0)[V]
- I_rms
- RMS current (≥ 0)[A]
- PF
- power factor, 0 ≤ PF ≤ 1
Reference: 230 V, 10 A, PF 0.8 lagging → S = 2300 VA, P = 1840 W, Q = 1380 var.
W, var and VA are distinct quantities: real, reactive and apparent power.