Ohm’s Law
Ohm’s law states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them. The mathematical equation that describes this relationship is:

where:

I is the current through the resistance in units of amperes,
V is the potential difference measured across the resistance in units of volts and
R is the resistance of the conductor in units of ohms.

More specifically, Ohm’s law states that the R in this relation is constant, independent of the current.