Electrical magnetisation and demagnetisation

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• 7 sections of explanation, worked examples and diagrams
• 1 practice task with hints and worked answers
• A quiz that marks itself as you go
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Other lessons in this sub-strand

1. Magnets, magnetisation and magnetic fields
2. Electromagnetic induction and where it matters
3. Soft iron magnetises and demagnetises easily
4. Magnetising by stroking
5. Electrical magnetisation and demagnetisation
6. The field around a bar magnet
7. Two magnets: unlike poles, like poles, neutral point
8. The compass and the Earth's magnetic field
9. Fridge magnets and other everyday magnets
10. Faraday and induced e.m.f.
11. The magnet-and-coil experiment
12. Factors affecting the size of the induced e.m.f.
13. How a generator works
14. How a transformer works
15. KPLC, transformers and electricity in Kenya