Cause of the resistance in a wire


The resistance of a conductor is the obstruction offered by the conductor to the flow of electric current through it.

Resistance (R) of a conductor is defined as the ratio of the potential difference (V) across the ends of the conductor to the current (I) flowing through it i.e.


The S.I unit of resistance is Ohm. Where 1 Ohm= 1volt/1ampere=1V/1A

Thus 1 ohm is the resistance of a conductor through which a current of 1 ampere flows when a potential difference of 1 volt is applied across the ends of the conductor.

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