Summary of Analogy Between Magnetic Circuits and Electrical Circuits
The following table summarizes the mathematical analogy between electrical circuit theory and magnetic circuit theory. This is mathematical analogy and not a physical one. Objects in the same row have the same mathematical role; the physics of the two theories are very different. For example, current is the flow of electrical charge, while magnetic flux is not the flow of any quantity.
| Magnetic equivalent | Symbol | Units | Electric equivalent | Symbol |
|---|---|---|---|---|
| Magnetomotive force (MMF) | ampere-turn | Definition of EMF | ||
| Magnetic field | H | ampere/meter | Electric field | E |
| Magnetic flux | φ | weber | Electric current | I |
| Hopkinson's law or Rowland's law | Ohm's law | |||
| Reluctance | 1/henry | Electrical resistance | R | |
| Permeance | henry | Electric conductance | G = 1/R | |
| relation between B and H | Microscopic Ohm's law | |||
| Magnetic flux density B | B | tesla | Current density | J |
| permeability | μ | henry/meter | Electrical conductivity | σ |
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