Ohm's Law Calculator
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Enter any 2 values then click "Calculate". The unknown values will be calculated.
Ohm's Law defines the relationship between power, voltage, current, and resistance. The various possible formulas for Ohm's law are as follows.
Where
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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