# Ohm's Law Calculator

You do not have JavaScript enabled.

The conversions on this site require the use of JavaScript so please enable before continuing. For assistance in enabling JavaScript, please contact the webmaster.

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

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

Where

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}