Dear Student Resistance of a conductor is defined as the opposition to the flow of electrical current through a conductor. Resistance is a property of conductor due to which it resists the flow of electric current through it. Component that is used to resist the flow of electric current in a circuit is called resistor.
Numerically we can defined resistance as
Resistance of a conductor is defined as the ratio between potential differences between the two ends of the conductor to the current flowing through it. R = V/i
If i = 1, R = V.
Resistance of a conductor can also be defined as the difference of potential across the two ends of the conductor required to pass a unit electric current through it.