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Ohm's law Main article: Ohm's law Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points. Introducing the constant of proportionality, the resistance,[12] one arrives at the usual mathematical equation that describes this relationship:[13]

{\displaystyle I={\frac {V}{R}}}I={\frac {V}{R}} where I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor 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.[14