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Flyer22 Frozen (talk | contribs) m Reverted edits by 101.165.104.215 (talk) to last version by Stevietheman |
goes over same concept in more detail |
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{{redirect|Light bulb}} |
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{{redirect|Electric lamp|the item of furniture|light fixture}} |
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{{refimprove|date=November 2014}} |
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[[File:Lelightbulbs.jpg|160px|thumb|Various compact fluorescent (CFL) lightbulbs]] |
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[[File:Gluehlampe 01 KMJ.jpg|160px|thumb|A clear glass 60 W Neolux light bulb]] |
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A '''lamp''' is a replaceable component such as an [[incandescent light bulb]], which is designed to produce [[light]] from [[electricity]].<ref>{{cite web |url=http://dictionary.reference.com/browse/lamp |title=Lamp |work=Dictionary.com |accessdate=Nov 9, 2014}}</ref> 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, two metal caps or a bayonet cap. |
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==Types== |
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There are several types of lamp: |
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*[[Incandescent lamp]], a heated filament inside a glass envelope |
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**[[Halogen lamp]]s use a [[fused quartz]] envelope, filled with halogen gas |
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*[[LED lamp]], a solid-state lamp that uses [[light-emitting diode]]s (LEDs) as the source of light |
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*[[Laser diode lamp]] |
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*[[Arc lamp]] |
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**[[Xenon arc lamp]] |
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**Mercury-xenon arc lamp |
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**[[Ultra-high-performance lamp]], an ultra-high-pressure mercury-vapor arc lamp for use in [[Image projector|projector]]s |
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**[[Metal-halide lamp]] |
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*[[Gas-discharge lamp]], a light source that generates light by sending an [[electrical discharge]] through an [[ionized gas]] |
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**[[Fluorescent lamp]] |
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***[[Compact fluorescent lamp]], a fluorescent lamp designed to replace an incandescent lamp |
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**[[Neon lamp]] |
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**[[Mercury-vapor lamp]] |
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**[[Sodium-vapor lamp]] |
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**[[Sulfur lamp]] |
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**[[Electrodeless lamp]], a gas discharge lamp in which the power is transferred from outside the bulb to inside via electromagnetic fields |
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==Uses other than illumination== |
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Lamps can be used as heat sources, for example in [[Incubator (egg)|incubator]]s and toys such as the [[Easy-Bake Oven]]. |
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Filament lamps have long been used as fast acting [[thermistor]]s in electronic circuits. The filaments are most likely made out of tungsten. Popular uses have included: |
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* Stabilisation of sine wave oscillators |
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* Protection of [[loudspeaker|tweeters]] |
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* [[Automatic volume control]] in telephones |
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==Lamp circuit symbols== |
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In [[circuit diagram]]s lamps usually are shown as symbols. There are two main types of symbols, these are: |
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{{Gallery |
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|lines=4 |
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|File:Lamp symbol.svg|The cross in a circle, which usually represents a lamp as an indicator. |
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|File:Lamp symbol, old.svg|The semicircular dent in a circle, which usually represents a lamp as a source of light or illumination. |
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|File:LampSymbol.png|Another Electronic symbol for Lamp |
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}} |
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==See also== |
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* [[Light source]] |
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* [[Light tube]] |
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* [[List of light sources]] |
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==References== |
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{{Reflist}} |
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{{Artificial light sources}} |
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[[Category:Lighting]] |
[[Category:Lighting]] |
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[[Category:Types of lamp]] |
[[Category:Types of lamp]] |
Revision as of 06:02, 19 March 2015
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