An electromechanical solenoid is a device that uses electrical energy to produce linear motion. It consists of a coil with a slug of metal in the middle. When current passes through the coil, the slug is pulled into the center of the coil, which makes it possible for the solenoid to pull from one end. An example of this is a lock-style solenoid. Nowadays, lock-style solenoids are used as smart locks. Read more