## Tuesday, June 4, 2013

### Analogies between magnetic circuits and electrical circuits

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)