Relate apparent (kVA), real (kW) and reactive (kVAR) power via the cos φ power factor.
Formula
$$ S^2 = P^2 + Q^2, \quad P = S \cos\varphi $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $P$ | Real power | kW | wattmeter |
| $S$ | Apparent power | kVA | derived |
| $Q$ | Reactive power | kVAR | derived |
| $cos φ$ | Power factor | - | power-factor meter |
Sources
- IEC 60034 - Rotating electrical machines.