Connecting wires in a circuit are made of copper and aluminium.

i.                     Copper and aluminium offer a low resistance to the flow of current and hence they are good conductors of electricity.

ii.                    Copper and aluminium are highly ductile and hence can be used for preparing the wire.

iii.                  Copper being more ductile, it is used in making thin wires, and aluminium is used for making thicker wires.

iv.                  Thus, they are suitable for making wires used in electrical circuit.