Linear motor: An iron core jumps into a solenoid.

Linear motor: An iron core jumps into a solenoid. Throughout the technical world, the solenoid motor has been used for mechanical controls. Typical examples are the electric clutch in automobile air conditioners, transmission shifters in washing machines, and electric door latches on the entrances to apartment buildings. To operate the demonstration, slide the core about halfway into the coil, then apply power. The core will be vigorously drawn into the center of the coil. With power still on, demonstrate that the core cannot be withdrawn. Turn off the power, and remove the core easily. The timer box alerts the operator to turn power off before the coil roasts.