define the filament of the bulb?
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An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated until it glows. The filament is enclosed in a glass bulb with a vacuum or inert gas to protect the filament from oxidation
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The word Filament itself refers to the wire or thread inside the bulb which lights up when you turn it on.filament is a conducting wire with a high melting point, forming part of an electric bulb or thermionic valve and heated by an electric current. the filament of bulbs is made up of tungsten.
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