Plug
1. Plug is a device for making an electrical connection between an appliance and the mains, consisting of an insulated casing with metal pins that fit into holes in a socket.
2. Plug is a part at the end of an electric cord that has two or three metal pins that connect the cord to a source of electricity.
Each part of the plug has a 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).
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