Electromagnetics and Power

Makers of electrical appliances depend on electromagnets to drive their devices' motors, according to the Universe Today website, while the rotating magnets in generators' drive shafts make it possible to provide electrical power to entire cities.

Electromagnets as Relays

An electromagnet's response to electrical signals allows it to turn switches on or off in relay. For this reason, electromagnets see daily use in telephone systems, computer networks and electronic devices.

Interactions with Metals

When an electromagnet receives current, it attracts metals. This makes electromagnets invaluable in sorting metals for manufacturers and for lifting heavy metallic objects in junkyards.

Modern Mass Transit

Modern express trains in Europe and Asia get their high speeds from what the Guardian.co.uk website calls a maglev system, floating the cars on a cushion of air. Electromagnets create the force that levitates these "bullet trains."

The Future

Electromagnets will continue to play a major role in new technologies. According to MIT's Technology Review, NASA has developed a prototype for an electromagnetic propulsion system that may power future spacecraft.

Source:

Universe Today: Uses of Electromagnets

Guardian.co.uk: Probably the world's fastest train; Sean Dodson; Jan. 15, 2004

Technology Review: Riding a Slingshot into Space