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In this Physics video in Hindi for class 12 we explained Ohm’s law and resistance and we also discussed on the formula of Ohm’s law. This law interrelates the potential difference across a conductor and the current through that. It is found that the potential difference is proportional to the current. Hence the formula V = R I. Here R is the constant of proportionality and is known as the resistance of the conductor. Resistance is defined as the ratio of potential difference to the current.