Ohm's law

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Ohm's law states that in a well-behaved conductor (a so-called ohmic conductor), the electric current between two points is directly proportional to the voltage (the difference of electric potential) across the two points. Introducing the constant of proportionality, the resistance, one arrives at the following mathematical equation used to describe this relationship: V = I R {\displaystyle V=IR} or, equivalently, at the same equation expressed in terms of the reciprocal constant of proportionality, the electrical conductance, I = G V {\displaystyle I=GV} where I is the current through the conductor, V is the voltage measured across the conductor, R is the resistance of the conductor, and G=1/R is the conductance of the conductor. More specifically, Ohm's law states that the R (or, equivalently, G) in this relation is constant, independent of the current...

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