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How do light bulbs work? |
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ANSWER
A thread of metal, usually tungsten, is used as an electrical filament to convert electricity into light in incandescent light bulbs (as developed in 1878 by Joseph Wilson Swan, among others), and into heat in vacuum tube devices.
The first successful light bulb filaments were made of carbon (made from oxidised bamboo), later replaced with tungsten.
ANSWER
An electrical current travels through the filament and because of the electrical resistance of the filament makes it white-hot and generates light and heat. It is normally in a vacuum or a noble gas or inert gas inside a glass enclosure to stop oxidation. Small amounts of a halogen can be added to facilitate transport of evaporated tungsten atoms back to the filament, resulting in significantly prolonged lifetime when used at higher temperatures, which is exploited in halogen lamps. Electrical filaments are used in hot cathodes of various types of vacuum tubes and electron guns as sources of electrons.
First answer by ID3451680012. Last edit by ID3451680012. Question popularity: 14 [recommend question]
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