Physics & Engineering / Electrical Engineering
Three-Phase Power Calculator
Common: 208V, 240V, 480V (line-to-line) or 120V, 277V (line-to-neutral)
Typical: 0.8-0.95 for motors, 0.95-1.0 for resistive loads
Three-Phase Power Formulas
Real Power (P): P = √3 × V × I × PF
Apparent Power (S): S = √3 × V × I
Reactive Power (Q): Q = √(S² - P²)
Current (I): I = P / (√3 × V × PF)
Where √3 ≈ 1.732
Note: Balanced three-phase system assumed. V = line-to-line voltage, I = line current.
See Also
Other calculators in Electrical Engineering