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It is used to calculate the equivalent resistence
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By using Ohm's law, you are able to find the resistance of a circuit, knowing only the voltage and the current in the circuit.

In any equation, if all the variables (parameters) are known except one, that unknown can be found. For example, using Ohm's law, if current (I) and voltage (E) are known, resistance (R) the only parameter not known, can be determined:

Basic formula:

Remove the divisor by multiplying both sides by R:

Result of step 2: R x I = E
To get R alone (on one side of the equation) divide both sides by I:

The basic formula, transposed for R, is:

Refer to figure 3-3 where E equals 10 volts and I equals 1 ampere. Solve for R, using the equation just explained.


E = 10 volts
I = 1 ampere
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