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 |
Read more about this topic: Magnetic Circuit
Famous quotes containing the words summary, analogy, magnetic, circuits and/or electrical:
“Product of a myriad various minds and contending tongues, compact of obscure and minute association, a language has its own abundant and often recondite laws, in the habitual and summary recognition of which scholarship consists.”
—Walter Pater (1839–1894)
“The analogy between the mind and a computer fails for many reasons. The brain is constructed by principles that assure diversity and degeneracy. Unlike a computer, it has no replicative memory. It is historical and value driven. It forms categories by internal criteria and by constraints acting at many scales, not by means of a syntactically constructed program. The world with which the brain interacts is not unequivocally made up of classical categories.”
—Gerald M. Edelman (b. 1928)
“We are in great haste to construct a magnetic telegraph from Maine to Texas; but Maine and Texas, it may be, have nothing important to communicate.”
—Henry David Thoreau (1817–1862)
“The Buddha, the Godhead, resides quite as comfortably in the circuits of a digital computer or the gears of a cycle transmission as he does at the top of a mountain or in the petals of a flower.”
—Robert M. Pirsig (b. 1928)
“Few speeches which have produced an electrical effect on an audience can bear the colourless photography of a printed record.”
—Archibald Philip Primrose, 5th Earl Rosebery (1847–1929)