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Connectors for supplying direct current (DC) power are poorly standardized compared to domestic AC power plugs and sockets. DC plug is a common name used for one common type of cylindrical two-conductor plug available in a range of sizes and used to power small pieces of electronic equipment. It is also used to describe some older multi-pin plugs.

Several competing standards exist for DC plugs, and in some cases incompatible plugs will fit together, or can be made to fit, possibly damaging equipment if:

Cylindrical types

Also known as barrel connectors, concentric barrel connectors or tip connectors, small cylindrical connectors come in an enormous variety of sizes.

The intended use of these plugs is on the cable connected to a power supply. The matching jack or socket is then mounted in the equipment to be powered. Some of these jacks contain a normally closed contact, which can be used to disconnect internal batteries whenever the power supply is connected, avoiding the risk of battery leakage or explosion posed by incorrect recharging of the batteries. Power cord.