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If the value of the resistance is desired, the known values of current and voltage are used for solving the problem by use of the formula:

R = E/I or V/I

As an example, assume that the voltage across a resistance is 50 volts and the value of the current flow is 10 amps. Dividing the E value by the I value indicates a resistance of 5 ohms.

Because power is related to Ohm's law, the amount of power used can be used in formulas for finding unknown values of current and voltage.

I = P/E
R = P/I squared
E = the square root of PxR

I = the square root of P/R (power divided by resistance)