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| style="height:20px; width:200px; text-align:center;" |A [[diode]] only allows [[Electrical Current|current]] through in one direction.
| style="height:20px; width:200px; text-align:center;" |A [[Light Emitting Diode|light emitting diode (LED)]] only allows [[Electrical Current|current]] through in one direction and produces light when a [[Electrical Current|current]] flows passes through it.
| style="height:20px; width:200px; text-align:center;" |A [[fuse]] is a thin piece of [[wire]] that will [[melt]] if too much [[Electrical Current|current]] passes through it.
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