A solenoid generates a magnetic field when an electrical current is passed through it. When someone rings a doorbell, for instance, electric current flows through a solenoid, which generates a ...

Previous injector designs used electro-magnetic solenoids to move the injector ... In piezo injectors, a stack of piezo crystals expand when an electric current is applied. The piezo actuators ...

A coil of wire, or solenoid, consists of a wire coiled up into a spiral shape. When an electric current flows, the shape of the magnetic field is very similar to the field of a bar magnet.