Magnetic Circuit VS Electric Circuit | Difference between Electric circuit and Magnetic Circuit

Magnetic Circuit VS Electric Circuit | Difference between Electric circuit and Magnetic Circuit | Magnetism

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Similarities Between Magnetic Circuit and Electric Circuit:

Magnetic Circuit	Electric Circuit
The closed path for magnetic flux is called a magnetic circuit.	The closed path for electric current is called an electric circuit.
Flux, f =m.m.f./reluctance	Current, I =e.m.f. / resistance
m.m.f. (ampere-turns)	e.m.f. (volts)
Reluctance, S =l / 0r aµ µ	Resistance, R = ρ* l/a
Flux density, B =φ/a Wb m2	Current density, J =I/a A m2
m.m.f. drop = φ S	Voltage drop = I R
Magnetic intensity, H = NI / L	Electric intensity, E = V/d
Permeance	Conductance
Permeability	Conductivity

Dissimilarities between Magnetic Circuit and Electric circuits:

Magnetic circuit

Electric circuit

Truly speaking, magnetic flux does not

flow

The electric current actually flows in an

electric circuit.

There is no magnetic insulator. For

example, flux can be set up even in the air

(the best known magnetic insulator) with

reasonable m.m.f

There are several electric insulators.

For instance, the air is a very good insulator and

current cannot pass through it.

The value of µr is not constant for a given

magnetic material. It varies considerably

with flux density (B) in the material. This

implies that the reluctance of a magnetic

circuit is not constant rather it depends

upon B.

The value of resistivity (ρ) varies very slightly

with temperature. Therefore, the resistance

of an electric circuit is practically constant.

This salient feature calls for different

approaches to the solution of magnetic and

electric circuits.

No energy is expended in a magnetic

circuit. In other words, energy is required

in creating the flux, and not in maintaining

it.

When current flows through an electric

circuit, energy is expended so long as the

current flows. The expended energy is

dissipated in the form of heat.

Comments

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