MAKING MAGNETS WITH AN ELECTRIC CURRENT

• A magnet created by wrapping a current-carrying wire around a ferromagnet core.

  Electromagnet
• Properties of electromagnets:

  • The magnetic field around an electromagnet can be turned off by turning off its current
  • The strength of an electromagnet can be controlled.
  • The poles of and electromagnet can be reversed
• A device that uses and electric current to produce motion.

  Electric motor
• Components of a simple electric motor:

  • coil of wire connected to a rotating shaft
  • permanent magnet
  • a source of electric current
• The properties of electric motor:

  • Unlike poles attract
  • Similar poles repel
  • Reversing the electric current