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Lamp (electrical component): Wikis

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Various Compact fluorescent (CFL) lightbulbs.
A clear glass 60W Neolux light bulb.

A lamp is a replaceable component such as an incandescent light bulb, which is designed to produce light from electricity. These components usually have a base of ceramic, metal, glass or plastic, which makes an electrical connection in the socket of a light fixture. This connection may be made with a screw-thread base, two metal pins, 2 metal caps or a bayonet cap. Re-lamping is the replacement of only the removable lamp in a light fixture.

Lamps in electronics

Filament lamps have long been used as fast acting thermistors in electronic circuits. Popular uses have included:

Lamp circuit symbols

In circuit diagrams lamps usually are shown as symbols. There are two main types of symbols, these are:

The cross in a circle, which usually represents a lamp as an indicator.  
The semicircilar dent in a circle, which usually represents a lamp as a source of light or illumination.  
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