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==Key Stage 4==
===Meaning===
[[File:3CoreLabelled.png|right|300px|thumb|This [[diagram]] shows the [[Earth Wire|earth wire]] in the [[3-Core]] cable.]]
The '''earth wire''' is an [[Wire|electrical wire]] found in [[3-Core]] that is connected to ground giving it a [[Electrical Potential|potential]] of 0V.
: The [[Earth Wire|earth wire]] improves the safety of [[Electrical Appliance|electrical appliances]].
: The [[Earth Wire|earth wire]] is connected to the [[metal]] case of an [[Electrical Appliance|electrical appliance]] so that if the [[Live Wire|live wire]] breaks and touches the [[metal]] the [[Electrical Current|current]] will go down the [[Earth Wire|earth wire]] and cause the [[Electrical Fuse|fuse]] to break.
{| class="wikitable"
|-
|[[File:ElectricalPlugOpen.png|center|300px]]
|[[File:ElectricalPlugLabelled.png|center|300px]]
|-
| style="height:20px; width:200px; text-align:center;" colspan = "2" |The [[Earth Wire|earth wire]] is attached to the top pin in an [[Electrical Plug|electrical plug]].
|}