AC power plugs and sockets
AC power plugs and sockets connect devices to mains electricity to supply them with electrical power. A plug is the connector attached to an electrically-operated device, often via a cable. A socket is fixed in place, often on the internal walls of buildings, and is connected to an AC electrical circuit. Inserting the plug into the socket allows the device to draw power from this circuit.
Ratings of NEMA 5-15 (type B) plug marked on the label (left: 7 A 125 V), engagement face, and C13 connector at the appliance end of the cord (centre, left: both 10 A 125 V).
A plug strip with two USB ports and built-in surge protection
A French CEE 7 adaptor
An old US multisocket adaptor
Mains electricity or utility power, grid power, domestic power, and wall power, or, in some parts of Canada, hydro, is a general-purpose alternating-current (AC) electric power supply. It is the form of electrical power that is delivered to homes and businesses through the electrical grid in many parts of the world. People use this electricity to power everyday items by plugging them into a wall outlet.
A table lamp connected to a wall socket (the mains)
A 50 Hz ±5 Hz vibrating-reed mains frequency meter for 220 V