Analogies between magnetic circuits and electrical circuits are easy to be made by comparing electric circuit and magnetic circuit.
- The magnetic flux Φ which flows( not actually flow but sets up) through a magnetic circuit, corresponds to the electrical current / which flows through an electrical circuit;
- the magneto-motive force MMF, corresponds to the electromotive force V (voltage);
- reluctance S of a magnetic conductor by lenght,area of X- section and permeability, corresponds to resistance R of an electrical conductor by lenght, area of X-section and conductivity
- finally Hopkison's Law MMF = R.Φ corresponds to Ohm's Law EMF(V) = IR
We can also define the permeance of a magnetic circuit P = 1/S, which corresponds to G = 1/R conductance of an electrical circuit.
| Magnetic circuit | Electrical circuit |
| Flux (Φ) | Current (I) |
| Magnetomotive force(F) | Electromotive force (V) |
| Reluctance (R) | Resistance (R) |
| Permeance (P) | Conductance (G) |
| Hopkison's Law (F = R.Φ) | Ohm's Law (V = R.I) |
