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| style="height:20px; width:200px; text-align:center;" |The symbol for an '''electrical bulb'''.
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==Key Stage 4==
===Meaning===
[[File:BulbSymbol.png|right|300px|thumb|The symbol for an '''bulb'''.]]
An '''electrical bulb''' is a [[circuit]] [[Electrical Component|component]] that gives out [[light]] when [[electricity]] goes through it.
===About Electrical Bulbs===
: An '''electrical bulb''' usually refers to a [[Filament Bulb]]. However, there are other types.
: In a [[Filament Bulb|filament]] '''bulb''' [[Electrical Work|electrical work]] is done to [[heat]] the filament to a high enough [[temperature]] that it glows in [[Visible Light|visible light]], see [[Black Body Radiation|black body radiation]].
: The [[Electrical Current|electrical current]] has a [[heating]] effect on the filament which increases its [[temperature]]. This causes the [[Electrical Resistance|resistance]] to increase, so the '''bulb''' does not behave as an [[Ohmic Conductor|ohmic conductor]].