// multi-utility computation suite · offline · instant · precise
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eng.three-phase Calculator
Calculates three-phase power (P = √3 × VL × IL × pf), line current, and phase quantities for balanced three-phase AC systems. Three-phase systems are more efficient than single-phase for power transmission — the power density is 1.73× higher for the same conductor cross-section.
Inputs
Vl
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Il
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Pf
A multiplier applied in the calculation.
Eff
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
active power (kW)
Reference formula or conversion factor shown for context.
apparent power (kVA)
Voltage in kilovolts (kV). 1 kV = 1,000 V. Used for high-voltage transmission lines and industrial equipment.
reactive power (kVAR)
Voltage in kilovolts (kV). 1 kV = 1,000 V. Used for high-voltage transmission lines and industrial equipment.
phase voltage (V)
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.