⚡ Electrical Engineering
Power Calculator
Calculate electrical power, current, voltage, and resistance using Ohm's Law.
Voltage (V)
V
Voltage in volts (V)
Current (I)
A
Current in amperes (A)
Resistance (R)
Ω
Resistance in ohms (Ω)
Power Factor (PF)
—
Power factor (0-1), for AC circuits
Power
0%
Power (P)
0 W
real power
Apparent Power
0 VA
Reactive Power
0 VAR
Power Factor
0.85
Voltage × Current
0 VA
📐 Ohm's Law Formulas
P = V × I
Power = Voltage × Current
V = I × R
Voltage = Current × Resistance
I = V ÷ R
Current = Voltage ÷ Resistance
P = I² × R
Power = Current² × Resistance
📊 Calculation Breakdown
| Parameter | Value | Formula |
|---|
How the formula works
P = V × I × PF | S = V × I | Q = √(S² − P²) | V = I × R
- P (Real Power) = V × I × PF — Actual power consumed (Watts)
- S (Apparent Power) = V × I — Total power in circuit (VA)
- Q (Reactive Power) = √(S² − P²) — Power stored and returned (VAR)
- PF (Power Factor) = P ÷ S — Efficiency of power usage (0-1)
- V = I × R — Ohm's Law: Voltage = Current × Resistance