Ohm's Law Calculator

Enter any 2 values then click "Calculate". The unknown values will be calculated.

**Information: **

Ohm's Law defines the relationship between power, voltage, current, and resistance. The various possible formulas for Ohm's law are as follows.

P = power in watts

E = voltage in volts

I = current in amps

R = resistance in ohms

P = E^{2}/R

P = I^{2} * R

P = E * I

E = sqrt(P * R)

E = P/I

E = I * R

I = E/R

I = P/E

I = sqrt(P/R)

R = E/I

R = E^{2}/P

R = P/I^{2}