Barrel Jack

A barrel jack is a cylindrical electrical connector commonly used for low-voltage DC power connections in electronic devices. It consists of a hollow cylindrical plug that fits into a matching receptacle, with the outer barrel serving as one electrical contact and an inner pin or socket serving as the other. Barrel jacks are widely used for power adapters, wall transformers, and portable electronics due to their simple design, secure connection, and ability to handle typical DC voltage and current requirements safely.