Define ohm's law .

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Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

Explanation:

Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship: 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 units of ohms.

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