Electrical Engineering › Section H · Magnetic circuits and inductors › Topic H.2
Reluctance, magnetizing force, and hysteresis
A coil drives flux round an iron core much as a battery drives current round a resistor. This topic builds that analogy, then shows where it breaks down: iron's response depends on how hard it is driven and on its own history.
In this topic
- Borrowing the electric-circuit pattern
- Reluctance
- Magnetomotive force and Ohm's law for magnetic circuits
- Worked example: flux in a ring core
- Magnetizing force and B = μH
- The B-H curve and saturation
- Worked example: reading a curve
- The hysteresis loop
- Why iron behaves this way: domains
- Hysteresis loss, soft and hard materials
- Common mistakes to avoid
- Key takeaways
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