Give reasons for the following:
$(i)$ Tungsten is used almost exclusively for the filament of electric lamps.
$(ii)$ Why do we use copper and aluminium wires for the transmission of electric current?

(N/A) $(i)$ Tungsten is used in making the filament of an electric bulb because:
$(a)$ Tungsten has a very high melting point $(3380 \ ^\circ C)$,which allows it to glow at high temperatures without melting.
$(b)$ It has high resistivity,which allows it to produce a large amount of heat when current passes through it.
$(ii)$ Copper and aluminium are used for the transmission of electric current because:
$(a)$ They have very low electrical resistivity,which minimizes energy loss during transmission.
$(b)$ They are excellent conductors of electricity,allowing current to flow efficiently over long distances.