Electrical Engineering › Section H · Magnetic circuits and inductors › Topic H.4
Faraday's and Lenz's laws
A changing magnetic flux through a coil produces a voltage across it. Faraday's law says how big that voltage is, and Lenz's law says which way it acts. Together they explain generators, transformers, microphones and the behaviour of every inductor.
In this topic
- From current to field, and back again
- Faraday's law
- Worked example: a changing field
- A conductor cutting flux
- Lenz's law
- Finding the direction: three steps
- Worked example: a magnet and a coil
- Signs in circuit work
- Eddy currents
- Induction at work
- Common mistakes to avoid
- Key takeaways
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