Free Electrical Power Calculator
Calculate electrical power using P = V * I, with additional forms P = I²R and P = V²/R.
V
A
Ω
Power (V*I)
600.0000 W
Power (I²R)600.0000 W
Power (V²/R)600.0000 W
Power (V*I) vs Voltage
Electrical Power
Electrical power is the rate of energy transfer in an electric circuit.
Three Equivalent Forms
P = V * I (voltage times current)
P = I² * R (current squared times resistance)
P = V² / R (voltage squared divided by resistance)
All three yield the same result when V, I, and R satisfy Ohm's law.
Example Calculation
A 120 V circuit drawing 5 A through a 24 ohm load.
- 01P = V * I = 120 * 5 = 600 W
- 02P = I² * R = 25 * 24 = 600 W
- 03P = V² / R = 14400 / 24 = 600 W
Frequently Asked Questions
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