How does an electric bulb glow?

Monday - 5 February, 2018
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Electric bulb is a device that produces light from electricity. In addition to lighting a dark space, they can be used to show an electronic device is on, to direct traffic, for heat, and many other purposes.

A metal is heated to extreme temperatures using electrical energy so as to emit a required amount of visible light without melting of metals at such high temperatures. Hence electric bulbs are manufactured with tungsten filaments as tungsten has very high melting temperature. However producing light by heating tungsten filament is highly inefficient as most of the energy is emitted as infrared light and only small part of input energy is converted into the useful visible light.

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