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Ohm’s Law and Resistance

According to the Ohm’s law, “The current flowing through a conductor is directly proportional to the potential difference across its ends provided the physical conditions (temperature, dimensions, pressure) of the conductor remains the same.” If I be the current flowing through a conductor and V be the potential difference across its ends, then according to Ohm’s Law, I α V.

 

This video explains how determine the resistance per cm of a given wire by plotting a graph of potential difference versus current.

 

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