1. Magnets and Electromagnets
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Magnets and Electromagnets

2. Magnetic or non-magnetic?
Magnetic or not?
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Material
Magnetic or non-magnetic?
Conclusion: only certain metals (iron, nickel and cobalt) are magnetic (and anything made from this, like steel)

3. Magnetic fields
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4. Attracting and Repelling
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5. 18/11/2018 N S
Magnet:
Solenoid:

6. (The poles can be reversed by reversing the direction of the current)
Electromagnets
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The strength of an electromagnet can be increased by doing three things:
Increasing the voltage
Increasing the number of coils
Inserting an iron core
(The poles can be reversed by reversing the direction of the current)

7. Examples of electromagnets
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2. Relay switch
1. Speaker

8. Uses of electromagnets 2 - An electric bell
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Uses of electromagnets 2 - An electric bell