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

P = I · V

I = V
R

P = I² R

R = V
I

P = V²

I = Current (A)

P = Power (W)

R = Resistance (Ω)

V = Voltage (V)

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