variety of incandescent lamp (q.v.) in which the light source is a fine electrical conductor heated by the passage of current.[9 related articles]
Found on
http://www.britannica.com/eb/a-z/f/24
These lamps rely on an incandescent metal filament to produce light. The interior of the lamp is filled with an inert gas in order to stop the filament from corroding. An electrical current, passed through the filament makes it extremely hot. When sufficiently hot, the filament itself will emit light radiation. Tungsten metal is chosen for the fila...
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http://www.users.zetnet.co.uk/computing/MainPage/SecDepts/Physics/Resources
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