An electromagnet is a magnet created by wrapping wire around an iron bar and passing an electric current through the wire. Electromagnets are found in devices like doorbells, computers, speakers, and telephones. Some cranes use powerful electromagnets to lift heavy iron or steel loads, releasing them by turning off the electromagnet so the load drops back down.

9. Electromagnets
• An electromagnet is a
magnet made by
winding a wire with a
current around on an
iron bar
– Electromagnets: found
in doorbells,
computers, speakers,
and telephones

10. Electromagnets
• Some cranes have electromagnets that can
pick up heavy loads of iron or steel
– When the operator turns the electromagnet off,
the load drops to the ground!
– http://www.absorblearning.com/media/item.acti
on?quick=4v

13. Bill Nye: Magnetism