Lamp (electrical component)

From Infogalactic: the planetary knowledge core
(Redirected from Light bulb)
Jump to: navigation, search
Incandescent (left) and fluorescent (right) lightbulbs turned on

A lamp is a replaceable component that produces light from electricity.[1] Compact lamps are commonly called light bulbs; for example, the incandescent light bulb. Lamps usually have a base made of ceramic, metal, glass or plastic, which secures the lamp in the socket of a light fixture. The electrical connection to the socket may be made with a screw-thread base, two metal pins, two metal caps or a bayonet cap.


There are several types of lamp:

Uses other than illumination

A clear glass 60 W Neolux light bulb

Lamps can be used as heat sources, for example in incubators and toys such as the Easy-Bake Oven.

Filament lamps have long been used as fast acting thermistors in electronic circuits. The filaments are most likely made out of tungsten. 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 semicircular dent in a circle, which usually represents a lamp as a source of light or illumination. 
Another Electronic symbol for Lamp 

See also


  1. "Lamp". Retrieved Nov 9, 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>