Electrical Engineering › Section H · Magnetic circuits and inductors › Topic H.3
Ampere's circuital law and magnetic circuits
Relays, transformers and motors all guide flux round a closed path of iron, often with a small air gap. Ampère's circuital law turns such a path into a circuit you can solve, much as Kirchhoff's laws do for resistors.
In this topic
- Magnetic circuits
- Ampère's circuital law
- Flux at a junction
- Why the table method beats reluctance
- Air gaps
- Worked example: a core with an air gap
- Worked example: a shell core
- The reverse problem: finding the flux
- Magnetic circuits at work
- Common mistakes to avoid
- Key takeaways
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