1.

Which metal is used for making bulb filaments? Why? What should we do to prolong the life of filament?

Answer»

Incandescent bulbs typically use a tungsten filament because of tungsten’s high melting point. A tungsten filament inside a light bulb can reach temperatures as high as 4500˚F. A glass enclosure prevents oxygen in the air from reaching the hot filament. Tungsten has very high resistivity so it does not burn easily at room temperature.

  • Krypton and Xenon filled light bulbs do not burn as hot as argon- filled ones. These gases also have larger atoms than argon gas, making them more effective at bouncing tungsten atoms back to the light filament. This in turn results in longer lasting light bulbs.  
  • Avoid frequent switching on and off the bulbs
  • Operate the bulbs at low power


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