← 4.4 Magnetism and electromagnetic induction
How a transformer works
General Science · Grade 10 · about 40 minutes
A changing current in one coil induces an e.m.f. in another coil on the same iron core, changing the voltage of an a.c. supply.
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- 8 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
- Magnets, magnetisation and magnetic fields
- Electromagnetic induction and where it matters
- Soft iron magnetises and demagnetises easily
- Magnetising by stroking
- Electrical magnetisation and demagnetisation
- The field around a bar magnet
- Two magnets: unlike poles, like poles, neutral point
- The compass and the Earth's magnetic field
- Fridge magnets and other everyday magnets
- Faraday and induced e.m.f.
- The magnet-and-coil experiment
- Factors affecting the size of the induced e.m.f.
- How a generator works
- How a transformer works
- KPLC, transformers and electricity in Kenya