The cigarette lighter receptacle in an automobile, initially designed to power an electrically heated cigarette lighter, became a de facto standard DC connector to supply electrical power for portable accessories used in or near an automobile. While the cigarette lighter receptacle is a common feature of automobiles, as a DC power connector it has the disadvantage of relatively low current rating and poor contact stability.
Examples of devices that can be operated from a cigarette lighter receptacle include lights, fans, beverage heating devices, and small motorized tools such as gas compressors for inflating tires. Many portable electronic devices such as music players or mobile telephones use a cigarette lighter receptacle to recharge their internal batteries or to directly operate from the vehicle electrical system. Adapters for electronic devices may change voltage to be compatible with the supplied device. Devices that require alternating-current mains electricity can be operated with a plug-in inverter.
Currently, automobiles may provide several 12 V receptacles that are intended only to operate accessories and that are not to be used with a cigarette lighter. Car manufacturers may make a cigarette lighter an optional extra-cost accessory. Usually, only one 12 V receptacle near the driver will accommodate an actual cigarette lighter, with other receptacles designated as "12 V auxiliary power outlets" which are not physically able to power a car lighter.
Read more about Cigarette Lighter Receptacle: History, Lighter Use, Use As An Electrical Outlet
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