Electrical Engineering › Section Y · Time-varying fields, Maxwell's equations, and plane waves › Topic Y.4
Transformers and the electric generator from field theory
The transformer and the generator were met earlier as circuit devices. Here both fall straight out of the field form of Faraday's law: transformer emf in one case, motional emf in the other, with the polarity rules and the low-frequency limits made explicit.
In this topic
- A transformer from Faraday's law
- Winding sense sets the sign
- Why cores are often toroids
- The transformer as a two-port
- Why transformers fail at low frequency
- Worked example: running at half frequency
- Isolation and baluns
- The generator: a loop turning in a field
- Worked example: a small alternator
- Common mistakes to avoid
- Key takeaways
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