Voltage V = R × I  (Formula 1)

Voltage V = P ÷ I  (Formula 2)

power P = V × I  (Formula 3)

Current I = P ÷ V  (Formula 4)

power P = V² ÷ R (Formula 5)

(Formula 5)Example: A heaterresistanceis 65Ω, and the power supply is 220V. Find its power

（220×220）÷65=744W

Pure DC resistance electric power, current, voltage automatic calculator

Enter any two values ​​and the third will be calculated.