Ohm's Law Calculator

Ohm's Law relates Voltage (V), Current (I), Resistance (R) and Power (P). Enter any two values to solve for the remaining two.

Ohm's Law Wheel

V = I × R = P / I = √(P × R)

I = V / R = P / V = √(P / R)

R = V / I = V²/P = P/I²

P = V × I = I²R = V²/R

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