What is an Electromagnet?

An electromagnet is a temporary magnet made by passing current through a wire that is wrapped around an iron core. If necessary, remind students that an electromagnet differs from other magnets because its magnetism is temporary, occurring only when electric current is passing through the wire. You can turn it on and off with a switch.

Electromagnets are a useful tool because you can control them. What are some of the ways to control an electromagnet? You can add and remove coils of wire to change its strength; you can increase or decrease the amount of current flowing in the coils of wire.

How can adding coils of wire to an electromagnet change its strength? It increases its strength because the more coils an electromagnet has, the stronger it is. What is the main difference between an electromagnet and a bar magnet?

An electromagnet is a temporary magnet; a bar magnet is a permanent magnet; it does not have an off switch. Project electromagnetic transparency and discuss. Ask ...

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