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==Key Stage 3==
===Meaning===
[[File:Speaker.png|right|300px|thumb|TextA picture of a [[speaker]].]]
A [[speaker]] is an electrical device that [[vibration|vibrates]] to produce a [[sound]].
: [[Speaker]]s use an [[electromagnet]] and a [[Permanent Magnet|permanent magnet]] to [[vibration|vibrate]] a paper cone.
: When the [[current]] changes direction the paper cone moves. An [[Alternating Current|alternating current]] causes the cone in the [[speaker]] to vibrate]].
{| class="wikitable"
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|[[File:SpeakerDiagram.png|center|400px]]
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| style="height:20px; width:200px; text-align:center;" |A [[diagram]] of a [[speaker]].
|}