Plugs, electrical plugs, and electrical sockets provide electric equipment connection to the alternating current (AC) power supply in buildings and at other various sites and devices with power access. The plug is the mobile connecter that is a part of the electrically operated device, and the socket is on the equipment or building structure and connected to the electrical circuit. In the 1880s, plugs and sockets for portable appliances became widespread and replaced the connections to light sockets with wall-mounted outlets. Standard systems of plugs and sockets differ across the world, and as a result, electrical plugs and sockets are varied in voltage, current rating, shape, size, and connector type.
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