Consider the following material: Copper, tungsten, chromium, aluminium, nichrome, iron.
Which of these is used to make
(a) Heating element?
(b) Filament of an electric bulb?

(a) Nichrome is an ideal material for heating.

Explanation

Nichrome is an ideal material for heating because it has relatively high resistance (At 20 ℃, Resistivity, ρ = 1.1 x 10^-6 Ωm). That is why it is used as the heating element in an electric iron.

(b) Tungsten is used as a filament of an electric bulb. 

Explanation

The reason tungsten is used as the filament in an electric bulb because it has the highest melting temperature of an element at 3600K. To get light, the filament needs to reach 2700-3300K to give off white yellow light.

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Updated on: 10-Oct-2022

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