A plug connects a device to the mains electricity supply.
The cable between the device and the three-pin plug contains three copper wires that are coated with plastic.
Each part of the plug has a function.
|Features of a plug||Function|
|Outer insulation||All three wires in the cable are bundled together and there is extra plastic insulation wrapped round them all for safety.|
|Cable grip||This holds the cable tightly in place so that wires do not become loose.|
|Live wire||Copper wire coated with brown plastic along which the current enters the device.|
|Fuse||A glass or ceramic canister containing a thin wire that melts if the current gets too high.|
|Neutral wire||Copper wire coated with blue plastic that also connects to the cable in the wall and completes the circuit.|
|Earth wire||Copper wire coated in striped plastic that provides a path for current to flow from the case of the device to the ground if there is a fault.|
One way of remembering the position of the wires is: