ProcirelCalculate 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.
P = V × I · P = I² × R · P = V² ÷ R
Results
How to use this calculator
Step-by-Step Instructions
1. **Enter any two known values** Voltage and Current, Voltage and Resistance, or Current and Resistance.
2. **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**