// multi-utility computation suite · offline · instant · precise
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eng.circuit-power Calculator
Calculates electrical power in AC and DC circuits from voltage, current, resistance, and power factor. For AC circuits, real power P = V×I×cos(φ) — the power factor cos(φ) determines how much apparent power converts to useful work.
Inputs
Voltage
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Current
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Resistance
Opposition to current flow (Ω). V = IR. Resistors in series add; in parallel their reciprocals add.
Power Factor
A multiplier applied in the calculation.
Results
real power (W)
Reference formula or conversion factor shown for context.
apparent power (VA)
Sample size or count used in the calculation.
reactive power (VAR)
Reference formula or conversion factor shown for context.
power factor
A dimensionless multiplier applied in the calculation.