2. Making magnets

3. Questions to think about…
What are the uses of electromagnets?
What are the ways to make a magnet?

4. What are the ways to make a magnet?
Two ways to make a magnet:
the stroke method
the electrical method
When a magnetic object becomes a magnet, we say that it is magnetised.
Let’s make magnets!

5. The stroke method
The iron filings are not attracted to a magnetic object such as an iron nail.
To make the iron nail into a magnet, you will need a strong bar magnet.

6. The stroke method
First, stroke the iron nail at least 20 times with one pole of a bar magnet.
Make sure you stroke the iron nail with the same pole.
Always repeat the strokes in the same direction.

7. The stroke method
Next, try to pick up the iron filings with the iron nail again.
The magnetised iron nail will be able to attract the iron filings.
The iron nail has now become a magnet.

8. The electrical method We can also make magnets using electricity.
Magnets made this way are called electromagnets.

9. The electrical method
To make an electromagnet, coil an electric wire at least 20 times around a magnetic object such as an iron nail.
Connect the ends of the wire to a battery.

10. The electrical method
If the iron nail can pick up the same things as a bar magnet, it has now become an electromagnet.

11. The electrical method
The electromagnet is a magnet only when it is connected to a battery or a source of electricity.
The iron nail loses its magnetism once it is disconnected from the battery (electrical source), and will not be able to attract magnetic objects.

12. What are the uses of electromagnets?
Scrap iron crane
Electromagnets are used in our daily lives.
Maglev train

13. What are the uses of electromagnets?
Hospital equipment
Telephone
Can you think of more examples?

15. The end