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electric light




An artificial light produced by a flow of electricity in a wire of gas. In an ordinary light bulb, light is produced by incandescence when a filament, such as tungsten-alloy wire, is heated by an electric current. 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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   • ELECTRICITY AND MAGNETISM
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