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 certain heaterresistanceis 65ω and the power supply is 220v, find its power

（220×220）÷65=744W

pure dc resistance electric power, current, voltage automatic calculator

please enter any two values ​​and the third value will be calculated.