## Permeance

Definition: It is the measure of the ease with which flux can be set up in a material. In other words, it measures the magnitude of the flux for the number of turns in an electric circuit. The permeance is analogous to the conductance in an electrical circuit. It is given as the reciprocal of …

## Magnetic Reluctance

Definition: The obstruction offered by a magnetic circuit to the magnetic flux is known as reluctance. As in electric circuit, there is resistance similarly in the magnetic circuit, there is a reluctance, but resistance in an electrical circuit dissipates the electric energy and the reluctance in magnetic circuit stores the magnetic energy. Also in an …

## Magnetomotive Force

Definition: The current flowing in an electric circuit is due to the existence of electromotive force similarly magnetomotive force (MMF) is required to drive the magnetic flux in the magnetic circuit. The magnetic pressure, which sets up the magnetic flux in a magnetic circuit is called Magnetomotive Force. The SI unit of MMF is Ampere-turn …

## Coefficient Of Coupling

The fraction of magnetic flux produced by the current in one coil that links with the other coil is called the coefficient of coupling between the two coils. It is denoted by (k). Two coils are taken coil A and coil B, when current flows through one coil it produces flux; the whole flux may …

## Magnetic Circuit

The closed path followed by magnetic lines of forces is called the magnetic circuit. In the magnetic circuit, magnetic flux or magnetic lines of force starts from a point and ends at the same point after completing its path. Flux is generated by magnets, it can be a permanent magnet or electromagnets. A magnetic circuit is …

## Electromotive Force (EMF)

The voltage developed by a battery or a dynamo or any other electrical source of energy is defined as Electromotive force or EMFs. It is denoted by (E), and its measuring unit is (V) volts. Example of such devices that produces EMFs are electrochemical cells, solar cells, transformers, electric generators and photodiode, etc., by which …

## Biot Savart Law

The Biot Savart Law is used to determine the magnetic field intensity H near a current-carrying conductor or we can say, it gives the relation between magnetic field intensity generated by its source current element. The law was stated in the year 1820 by Jean Baptisle Biot and Felix Savart. The direction of the magnetic …

## Phase Sequence

In a three-phase system, the order in which the voltages attain their maximum positive value is called Phase Sequence. There are three voltages or EMFs in the three-phase system with the same magnitude, but the frequency is displaced by an angle of 120 deg electrically. Taking an example, if the phases of any coil are …

## RC Circuit

Definition: The combination of a pure resistance R in ohms and pure capacitance C in Farads is called RC circuit. The capacitor stores energy and the resistor connected in series with the capacitor controls the charging and discharging of the capacitor. The RC circuit is used in camera flashes, pacemaker, timing circuit etc. The RC …