Electrical Power Calculator
Calculate electrical power using the three standard power formulas: P=V×I, P=I²×R, and P=V²/R. Enter any two known values to find power and the missing parameter. Essential for component selection, heat sink sizing, and power supply design.
Power
Real power1.150 kW
Formula usedP = V × I × PF
Apparent power (VA)1.150 kVA
Formulas used
P = V × I · P = I² × R · P = V² ÷ R
How to use this calculator
Step-by-Step Instructions
- Enter any two known values Voltage and Current, Voltage and Resistance, or Current and Resistance.
- Click Calculate The calculator determines which formula to use and displays the power in Watts along with all derived values.
Worked Example
A 12V power supply delivering 2A: P = 12 × 2 = 24 Watts