$(a)$ Give reason why tungsten is used for making filament of electric lamps.
$(b)$ The elements of heating electrical appliances are made$-$up of an alloy rather than pure metal.
$(a)$ Give reason why tungsten is used for making filament of electric lamps.
$(b)$ The elements of heating electrical appliances are made$-$up of an alloy rather than pure metal.
$(a)$ $(i)$ High resistivity. $(ii)$ High melting point.
$(b)$ $(i)$ High resistivity, high melting point.
$(ii)$ Do not oxidise or burn at high temperature.
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