# Transformer Construction|Animation |Animation |(Subtitles included) PiSquare Academy Hello everybody! In today’s lecture we will see the basic construction(very
basic construction) of a transformer. now, to start with. we must recall the quotation of William Stanley,
(rightly said), transformer is the heart of the alternating current system. There are two scientists, 1.Joseph Henry and
Michael Faraday. They discovered the property called induction. Which we know already. We know {Equation} We know this basic equation Now, we should recall the most important Law
in electrical engineering, i.e., Faraday’s Law If we will go to the first law, it says “any
relativity between a conductor and the flux will cause an emf to induce, that’s what first
says. Second law says, magnitude of induced emf
is proportional to the rate of change of magnetic flux linked, so these two are very much important
as well as flux and reluctance equations in our mind. Lets go further, We have a coil which is carrying some
alternating current i_AC and next to this, i am having another coil (we just have another
coil) which is not connected to any supply, just coil is present there. As i supplied this(coil) with some alternating
current, the flux which is coming out of this is also alternating. So flux is decreasing, increasing, decreasing
and increasing (so on…) like this. this alternating flux is linking with this
coil as well as this coil, so according to the Faraday’s Law, magnetic flux is linking with a conductor, this is also one conductor and this is also one conductor. Each and every this is one conductor here
also each and everything is one conductor. So, as this flux is linking with all these
conductors, there is some emf induced in all these conductors, Now, if you want to name,
the induced emf in this conductor, then it is called as self-induced emf. Because, emf induced in these conductors or
in these turns is because of its own flux, hence it is called as self-induced emf, the
emf induced in these conductors or in these turns, we will call it as mutual induced emf,
if we just recall, flux is inversely proportional to the reluctance, to increase the amount
of flux for the same amount mmf then we should reduce the reluctance, to reduce the reluctance
we will insert an iron core here, we are inserting an iron core, this will increase the permeability
(not permittivity) the magnetic path, which means, reluctance is reduced. Lets take same core form (what we had before)
we know the flux is passing like this as well as like this, this is also a flux path and
this is also a flux path, now by inserting an iron core here, we have reduced the reluctance
of this length, so for further reduction of reluctance, in here also we will keep an iron
core, which you can see there, now the complete flux path, (this path) is having less reluctance. We know reluctance is {Equation}, it depends
on the permeability (not permittivity) of the material, i have chosen a good material,
it depends on the area of the cross section and also depends on the length. Length is more then reluctance is more and
hence flux is less. so what if i change the same construction,
to a different configuration, lets break this into different parts, i have broken this into
different parts, let’s rearrange them in another configuration, lets put these, with this configuration
i have a closed path which is of less length than this, and i could save this material
also, So this is one form of transformer which is
called as core type transformer. so this is the basic construction of a transformer,
we will do many modifications on this to increase the magnetic linkage even further
like shell type, and different types of windings so on.. we will see those in further classes. Thanks for watching the video.