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Qmechanic
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What exactly does Ohm's law say?

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, R one arrives at the usual mathematical equation that describes this relationship:

$$V=IR.$$

Then why the assertion that V=IR is a statement of Ohm's law is not true?