Electrical

Power Calculator — ChiefEngineer.in

Calculate electrical power for DC, single-phase or three-phase.

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Formula

P = VI·PF (1φ), P = √3·VLIL·PF (3φ)
S = VI or √3·VLIL
Q = √(S² − P²)

Variables

  • V — voltage
  • I — current
  • PF — power factor

Worked Example

Input: 230 V, 10 A, PF 0.9, 1φ

Result: P = 2070 W, S = 2300 VA, Q ≈ 1002.5 VAR

Assumptions & Notes

Sinusoidal assumption. Real power factor may differ from displacement factor with harmonics.

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