Tungsten is used for the filament of electric bulb because it has high melting point and high resistance

Introduction
Tungsten is the preferred material for electric bulb filaments due to its unique properties that enhance performance and longevity.
High Melting Point
- Tungsten has an exceptionally high melting point of around 3422°C (6192°F).
- This allows it to withstand high temperatures without melting, which is crucial for producing light when electricity passes through.
Excellent Electrical Conductivity
- Tungsten exhibits good electrical conductivity, enabling efficient current flow.
- This property ensures that the filament can glow brightly when an electric current is applied.
Durability and Stability
- Tungsten is highly durable and resistant to corrosion and oxidation.
- This stability prolongs the lifespan of the filament, reducing the frequency of bulb replacements.
Low Thermal Expansion
- The thermal expansion of tungsten is relatively low compared to other metals.
- This characteristic minimizes the risk of breakage due to temperature fluctuations, enhancing the bulb’s reliability.
Brightness and Efficiency
- Tungsten filaments produce a bright, warm light that is desirable in household lighting.
- They convert a significant amount of electrical energy into visible light, making them more efficient than many other materials.
Conclusion
In summary, tungsten's high melting point, excellent conductivity, durability, low thermal expansion, and brightness make it an ideal choice for electric bulb filaments. This combination of properties ensures that tungsten filaments provide reliable and efficient lighting solutions.