Online power calculator

Formula for calculating electric power:

Voltage V = R × (1)

Voltage V = P ÷ (2)

Power P = V × (3)

Electric current I = P ÷ (4)

Power P = V2 ÷ R (5)

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


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

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

power P W(Watt)
Voltage V V(Electric current)
Electric current I A(ampere)