Give reason for the following :
(i) Why are copper and aluminium wires used as connecting wires ?
(ii) Why is tungsten used for filaments of electric lamps ?
(iii) Why is lead-tin alloy used for fuse wires ?

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Solution

(i) Copper and aluminium wires are used as connecting wires because they have low resistivity and are good conductors of electricity.
(ii) Tungsten has high melting point and great tensile strength. So it is used as light bulb filament in electric lamps.
(iii) Lead-tin alloy is used for fuse wires because it has low melting point.

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