Inductors-Working Principle- Inductance -EMF - Self Induced EMF - Mutually Induced EMF

in this easy ed video lecture we even learn about inductors wherein we will see the introduction working principle of an inductor inductance EMF induced in an inductor as self induced EMF and mutually induced EMF concept of a back EMF and types of inductors such as a coupled inductor multi-layer inductor ceramic core inductor and a molded inductor let's start with the introduction similar to a resistor or a capacitor and inductor is also a passive component when a metal wire is wound in a circular manner we get an inductor the symbol of an inductor is as shown it is represented by a capital L and it's unit is Henry but practically Henry becomes a very large unit we generally use smaller units like milli Henry or micro Henry which are one thousand and one millionth part of a Henry respectively seriously pay attention this is important the material on which the coils are wrapped is called as a core of an inductor when the coil is wound on a metal we get an iron core inductor and when there is no material and just circular windings we get an air core inductor let's study the working principle of an inductor now consider a circuit shown according to the magnetic effect of an electric current when a current passes through a coil or a conductor it reduces the magnetic field around that conductor this forms the basic principle of an inductor the magnetic field generates the flux around the conductor this flux changes as the current flowing through an inductor changes according to Faraday's law EMF gets induced in the conductor whenever a flux linked with that conductor changes this EMF is of two types such as self induced EMF and mutually induced EMF let's first study self induced e-m-f the EMF induced in the coil due to the change of its own flux linked with it is called as self induced EMF consider a coil having n turns carries the current I with the switch s when the switch S is closed as the current flows through the coil it would produce the flux in the coil this flux links with the coil itself as the magnitude of the current changes using a variable resistor the flux produced also changes according to Faraday's law give the rate of change of the flux linkages an EMF gets induced in the coil as the EMF gets induced without any physical motion of the coil or flux the induced EMF is called as a self induced EMF the property of a coil which opposes any change in the current passing through it is called as self inductance or only inductance the coefficient of self inductance is given by L the second type of EMF is mutually induced EMF if the flux produced by one coil is linked with the second coil and if the change in the flux produced by the first coil induces the EMF in the second coil then such an EMF is called as a mutually induced EMF consider the two coils a and B having N 1 and n 2 number of turns respectively current i1 flowing through the coil a produces the flux v 1 some part of the flux gets linked with coil B which we call as mutual flux Phi 2 now if we change the magnitude of the current flowing through the coil a by variable resistance the linked fluxes Phi 1 and Phi 2 also change according to Faraday's law change in the flux induces the EMF in the coil thus any change in current i1 induces the EMF in coil B this phenomenon is called as mutually induced e-m-f let's find the voltage induced in an inductor if a coil of n turns links the magnetic flux Phi then the coil has a flux linkage of n Phi and any current I that flows through the coil will produce an induced EMF then according to Faraday's law any change in this magnetic flux linkage produces a self-induced voltage in the single coil as VL equal to n into D Phi by DT equal to MU n square a upon L into di by DT seriously pay attention this is important let's see the concept of a back EMF now an inductor is a component that opposes the change in the current flowing through it hence whenever the current flowing through an inductor changes the inductor develops an EMF which opposes this current amplitude of this EMF is exactly equal and opposite of VL this is known as a back EMF now let's study why an inductor passes a DC signal and blocks an AC signal every component possesses some resistance the resistance offered by an inductor is called an inductive reactance and is denoted by X L it is given by the formula X l equals to PI FL where F is the frequency the frequency of the DC signal is zero thus XL becomes zero and the inductor offers very low resistance to DC but the frequency of an AC signal is non zero always thus an inductor opposes the AC signal and passes the DC signal only the next concept is types of inductors an inductor is mainly divided into four different types such as coupled inductor multi-layer inductor ceramic core inductor and a molded inductor first type of inductor is coupled inductor coupled inductors exhibit magnetic flux that is dependent on other conductors to which they are linked when mutual inductance is needed coupled inductors are often used a transformer is a kind of a couple inductor second type of inductor is a multi-layer inductor these inductors consists of a layered coil bound multiple times around the core as a result of the multiple layers and the insulation between them multi-layer inductors have a high inductance level the third type of an inductor is a ceramic core inductor although there are numerous kinds of course a ceramic core inductor is unique in having a dielectric ceramic core meaning it has a very low distortion and hysteresis last type of inductors are molded inductors these inductors are molded using a plastic or ceramic insulation they are often used in circuit boards let's take a quick review of what we've studied in this lecture when a metal wire is bound in a circular manner we obtain an inductor the symbol of an inductor is as shown it is represented by the letter L and it's unit is Henry when the current passes through a coil or a conductor it produces the magnetic field around that conductor this forms the basic principle of an inductor EMF induced in an inductor is of two types such as a self induced EMF and a mutually induced EMF voltage induced in an inductor is given by VL back EMF is an equal but opposite magnitude of VL an inductor is a component that passes the DC signal and blocks the AC signal different types of inductors are coupled inductor multi-layer inductor ceramic core inductor molded inductor

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Keywords: EzEd, Inductors, Working Principle of an Inductor, Inductance, EMF, EMF induced in an Inductor, Self Induced EMF, Mutually Induced EMF, Back EMF, Coupled Inductor, Multilayer Inductor, Ceramic Core Inductor, Moulded Inductor, Inductor working, Inductor and capacitor, Inductor in ac circuit, Inductor and Inductance, Electromotive Force, Engineering, Basic Electronic Engineering, BEE, Mumbai University, Pune University, F.E.

Id: AdxWTkPS0Jo

Length: 9min 15sec (555 seconds)

Published: Thu Sep 28 2017