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,

                                

                                                                   

where, R is the constant of proportionality. It is known as resistance of the conductor. Or