DC BARREL JACK WIRING

Wiring an 2 DC Barrel Jack - Arduino
Hello everyone, how do I need to wire a simple 2 DC Barrel Jack? So where do I need to connect the three legs? It's for an external power source for a DC motor, and I don't know where to connect the three pins of the 2 jack.
Connector Basics - learnkfun
Wall adaptors are widely available, in a variety of power ratings and voltages, making barrel connectors a common means for connecting power to small projects. The female barrel connector, or "jack", can be purchased in several varieties: PCB mounted (surface mount or
Coaxial power connector - Wikipedia
OverviewConnector construction and terminologyConnector sizesCommon sizes and interchangeabilityLocking and retention featuresStandardsA coaxial power connector is an electrical power connector used for attaching extra-low voltage devices such as consumer electronics to external electricity. Also known as barrel connectors, concentric barrel connectors or tip connectors, these small cylindrical connectors come in an enormous variety of sizes. Barrel plug connectors are commonly used to interface the secondary side of a power supply with the device. Some of these jacks contain a normally closed switch; the switch can disconnectSee more on enpedia · Text under CC-BY-SA license