Formula for calculating electric power：

Voltage V = R × I  （1）

Voltage V = P ÷ I  （2）

Power P = V × I  （3）

Electric current I = P ÷ V  （4）

Power P = V² ÷ R （5）

（5）Example: a heaterresistanceThe power supply is 220V, and its power is 65Ω.

（220×220）÷65=744W

Pure DC resistance electric power, current and voltage online automatic calculator

Please enter any two values, and the third values will be calculated.