Filament of a Bulb is Made Up of

Table of Contents

Filament of a Bulb is Made Up of

Carbon
Aluminium
Tungsten
Nickel

Ans. (3) Tungsten

Filament of a Bulb is Made Up of: Solution

Tungsten has high resistivity and High Melting point. Due to high resistivity, when current is passed through Tungsten filament, it gains high temperature and begins to glow immediately. Due to high melting point, it does not melt and break when electric current is passed through it. So, Tungsten is used a filament of electric bulb.

Why Tungsten is used as Filament of an Electric Bulb?

The Metal used as filament of a bulb, must have the qualities:

High Resistivity
High Melting Point

Why Resistivity must be High?

On passing electric current through a conductor with high resistivity, the conductor gains high temperature and starts to glow immediately.

Why Melting Point must be High?

On passing electric current through a conductor with high resistivity, the conductor becomes hot. So, melting point of the filament must be high, otherwise filament will melt and break.

Tungsten Metal has high resistivity and high melting point, so Tungsten is used as filament of an electric bulb.

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