Georg Simon Ohm had humble roots and struggled financially throughout most of his life, but the German physicist is well known today for his formulation of a law, termed Ohm's law, describing the mathematical relationship between electrical current, resistance and voltage.

Some people find it helpful to see an analogy between a system of solenoids and various magnetic materials and a simple electrical circuit. They see it as a "magnetic circuit".

We begin our analysis of magnetic system by developing the concept of Kirchoff’s voltage law for magnetic systems – in particular the idea that the sum of the magneto-motive force drops around any closed loop is equal to the sum of the magneto-motive force sources.

May 22, 2022 · For electrical circuits, Ohm's law states: V = IR. In like manner, for magnetic circuits, we have: F = ΦR (10.3.3) Where. F is the magnetomotive force (or MMF) in amp-turns, Φ is the magnetic flux in webers, R is the reluctance of the material in amp-turns/weber.

as Ohm’s Law. In magnetic circuits the lumped parameters are called ‘Reluctances’ (the inverse of ‘Reluctance’ is called ‘Permeance’). The analog to a ‘wire’ is referred to as a high permeance magnetic circuit element. Of course high permeability is the analog of high conductivity.

For magnetic circuits, the effect desired is the flux $\Phi$. The cause is the magnetomotive force (mmf) , which is the external force (or "pressure") required to set up the magnetic flux lines within the magnetic material.

This result is known as Ohm’s law: (5.4.1) where is the voltage measured in volts across the object in question, is the current measured through the object in amps, and is the resistance in units of ohms.

With magnetism, we have the following quantities to deal with: Magnetomotive Force -- The quantity of magnetic field force, or "push." Analogous to electric voltage (electromotive force). Field Flux -- The quantity of total field effect, or "substance" …

Dec 6, 2018 · Ohm’s Law determines what current is formed when you apply a force to charges. This results in $J=\sigma E$ for Coulomb forces. But you are free to specify any force (electric, magnetic, etc.).

Owing to the complexity of the exact description of plasmas containing fluctuating fields, it is useful to have equations which describe the behaviour of the mean magnetic field.