Ohms Law Calculator

Enter any two known values and press "Calculate" to solve for the others. For example, a 30 watt operating on 18 volts AC will have 10.8 ohms of resistance and will draw 1.66667 Amps. Fields should be reset to 0 before each new calculation.

Voltage (E) = Current (I) * Resistance (R)
Power (watts) = Current Squared (I^2) * Resistance (R)
Power = I*E = E^2 / R

Volts (E)
Amps (I)
Ohms (R)
Power (Watts)