Question

Why filament of electric bulb is made of tungsten
A. Melting Point of filament is very high.
B. Resistance of filament is very low.
C. Both.
D. None.

Answer 1

A small thin wire holds up an incandescent light bulb, which is supported by two larger wires. A filament is a type of wire. The filament of a light bulb is the component that generates light. The filament glows if an electric current passes through it. In a vacuum tube, it's also known as the electron emitting part. The filament material must possess the following characteristics: a high melting point, vapor pressure is low and resistivity is high.

Complete step-by-step solution:
Option A:
The resistance of the filament should be high in order for it to produce heat and light, and its melting point should be high in order for it not to melt at the high temperatures at which it is producing light.
So, option A is correct.
Option B:
Tungsten is a metal with a high resistivity. It has a very high melting point, so it doesn't melt even though it glows, which is why it's used in light bulbs.
So, option B is incorrect.
Option C:
Since tungsten has a high melting point and does not oxidise, it is used in electric bulbs. As a result, even though a large amount of heat is produced due to current passing through the filament, the tungsten filament does not melt.
So, option Cc is incorrect.
Option D:
Tungsten has a high melting point, making it ideal for light bulbs. Tungsten is used to make the filament of an electric bulb because it has the highest melting point, lowest vapour pressure, and greatest tensile strength of any metal. It can reach high temperatures before melting as a result of these.
So, option D is incorrect.
Hence option A is correct.
Note: Tungsten filaments are used in incandescent light bulbs. The filament, also known as the coiled coil, is normally made of fine wire coils to increase the bulb's light output.
Because of the following factors, tungsten is used to make the filament of an electric bulb:
It has a very high melting point since it is an alloy.
Because of its high resistivity, it does not quickly burn at room temperature.
The lamp burns brightly at high temperatures.