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electric light

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

electric light Artificial light produced by a flow of electricity in a wire or gas. In an ordinary light-bulb, an electric current heats a filament, such as tungsten-alloy wire, producing light by incandescence. In a fluorescent tube, the electric current passes through a gas. The gas atoms give off invisible ultraviolet rays. These strike a coating on the inside of the tube, causing it to emit light by fluorescence.

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