Question

Why is tungsten normally used for the construction of filaments of electric bulbs?

Hint:

Tungsten's high melting point and resistance to thermal expansion make it perfect for light bulb filaments. Remember: high temperature + durability = tungsten.

Answer 1

Tungsten is widely used for the construction of filaments in electric bulbs due to the following reasons:
1. High Melting Point: Tungsten has a very high melting point of about 3422°C, which allows it to withstand the high temperatures produced when the filament is heated to produce light. This is crucial for the filament's longevity and efficiency.
2. High Electrical Resistance: Tungsten has high electrical resistance, which causes it to heat up when an electric current flows through it, making it ideal for producing light.
3. Durability: Tungsten filaments have a long life compared to other metals due to their ability to withstand repeated heating and cooling cycles without breaking.
4. Strength and Flexibility: Tungsten is strong and flexible, allowing the filament to be drawn into very thin wires without breaking.
Thus, tungsten is the material of choice because it can handle high temperatures, resists corrosion, and ensures a longer lifespan for the filament.