Ohms law states that the current through a conductor between two points is directly proportional to the voltage across the two points, where the constant of proportionality is the resistance. The mathematical equation representing this relationship is

I = V/R

where I is the current through the conductor in units of amperes, V is the voltage measured across the conductor in units of volts, and R is the resistance of the conductor in ohms. Ohms law specifically states that the R in this relation is constant, independent of the current.