Ohm's Law & Calculator

Ohm's Law relates the three fundamental electrical quantities: voltage, current and resistance. Power relationships are also given.

Click here for a much more extensive treatment of Ohm's Law.

Ohm's Law triangle

 V = I · R    I = V


   R = V


 P = I · V  P = I2 R   P = V2


I = Current (A)

P = Power (W)

R = Resistance (Ω)

V = Voltage (V)

Ohm's Law Calculator

Please click the Calculate Button for results

I= A V =  V
R= P =  W
V= V I =  A
R= P =  W
V= V R =  Ω
I= A P = W