Question

Name the material used for (i) filament of an electric bulb,, and (ii) heating element of a room heater.

Answer 1

(i) Filament of an electric bulb:

A wire made of tungsten is used for the filament of electric bulb because it has a high melting point and high resistivity.

(ii) Heating element of a room heater:
A nichrome wire is used as a heating element for a room heater because the resistivity of nichrome is high and increase in its value with an increase in temperature is high.