What do you mean by resistance of a conductor? Define its unit.
(b) In an electric circuit with a resistance wire and a cell, the current flowing is I. what would happen to this current if the wire is replaced by another thicker wire of same material and same length? Give reason.

Explanation

The resistance of a conductor is a property of the conductor, which affects the flow of current through it on maintaining a potential difference across its ends.
Unit of resistance is ohm. Resistance of a conductor is said to be 1 ohm, if a potential difference of 1V is to be applied across its ends for maintaining flow of 1A current.
(b) If given resistance wire is replaced by another thicker wire of same material and same length then cross section area of wire is increased and consequently its resistance decreases [ As `R=(rho L)/A`] . So the current flowing in the circuit increases.