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Ohm's Law Calculator

Enter any two known values and press "Calculate" to solve for the others.
Voltage (E): Volts (V)
Current (I):
Resistance (R):
Power (P): Watts (W)
P = power in watts
E = voltage in volts
I = current in amps
R = resistance in ohms
P = E2/R
P = I2 * 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 = E2/P
R = P/I2
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