These days, electromagnetic coils, transformers, inductors, and other high-end electronic components are vitally important. You can find these components in a variety of medical devices and high tech military equipment.
Electromagnetic coils harness electricity for its magnetic effect. If you wrap a metal wire in coils and pass electricity through it, a magnetic field is created. The more coils, the stronger the magnetic field.
These can be found in anything from medical diagnostic equipment to motor vehicles, as there is a myriad number of applications for such a device. Unlike a permanent magnet, the magnetism of a coil can be controlled by manipulating the electricity on and off.
