Solenoids, ActuatorsA solenoid is an electromagnetic device that converts electrical energy into mechanical motion. It consists of a coil of wire that produces a magnetic field when an electric current is passed through it. This magnetic field then interacts with a ferromagnetic core inside the coil, causing it to move. Solenoids are commonly used in a variety of applications, including in door locks, fuel injectors, and other devices that require a controlled, linear motion. They are often used as actuators, which are devices that convert energy into motion. Solenoids are simple, reliable, and relatively low-cost, making them a popular choice for a wide range of applications.