a device which is designed to stop a fluid from flowing through a hole.
a mains power plug or other type of electrical connector that mates with a socket or jack, in particular used with electrical or electronic equipment or appliances (See Domestic AC power plugs & sockets.)
in the entertainment industry, a type of promotion, usually by mentioning one's product during a show
a way of planting seedlings. See Plug (horticulture).
In electronics, deciding which of two mating connectors is the plug and which the socket is sometimes arbitrary. In general:
The male connector is the plug, the female the socket. This may pose a problem if both connectors have some male and female characteristics, for example the XLR3.
The connector possessing the pins is the plug, the other the socket. This may pose a problem if both connectors have pins, for example the European 3-pin power connector.
The connector normally mounted on a cable is the plug, and the connector mounted on the equipment is the socket. See DC plug for an example of this usage. This may pose a problem if the usage changes with time.
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As the term suggests, plug-in hybrids - which look and perform much like "regular" cars - can be plugged in to a 120-volt outlet (for instance each night at home, or during the workday at a parking garage) and charged.
The plug-in hybrid drive system is compatible with all vehicle models and does not entail any sacrifice of vehicle performance or driver amenities.
All told, a plug-in that is fully charged every night can reduce emissions by 50% due to the improved fuel economy and the non-production of tail pipe emissions during the electric driving phase.