Input Parameters
About This Calculator
- DC: P = V × I
- 1φ AC: S = V × I, P = S × PF
- 3φ AC: S = √3 × V × I, P = S × PF
How this power calculator works
For DC: P = V × I. For AC systems, apparent power S includes the power factor.
Three-phase uses the √3 factor: S = √3 × V × I. Real power P = S × PF, reactive Q = √(S² - P²).
FAQ
Three-phase power formula?
S = √3 × V × I. P = S × PF.
Real vs apparent power?
Real (W) = useful work. Apparent (VA) = total. P = S × PF.
What is power factor?
P/S ratio, 0-1. Higher = more efficient.