Good afternoon.....sir
i am studying in EEE dept. final year i am looking technical related IEEE seminor paper so kindly requesting you please send me .

Thank you
Prasad

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. Electromagnetic induction produces an electromotive force within a conductor that is exposed to time-varying magnetic fields. Transformers are used to increase or decrease alternating voltages in electrical power applications.A variable current in the primary winding of the transformer creates a variable magnetic flux in the transformer core and a variable field that impinges on the secondary winding of the transformer. This variable magnetic field in the secondary winding induces a variable electromotive force (EMF) or voltage in the secondary winding due to electromagnetic induction. Using Faraday's law (discovered in 1831) in conjunction with core properties of high magnetic permeability, transformers can be designed to efficiently switch AC voltages from one voltage level to another within the electrical networks.

Since the invention of the first constant potential transformer in 1885, transformers have become essential for the transmission, distribution and use of AC power.  A wide range of transformer designs is found in electrical and electronic power applications. The transformers vary in size from RF transformers of less than one cubic centimetre in volume to the units that interconnect the electrical network that weighs hundreds of tons.

Basic Transformer Theory

Let's say you have a winding that is supplied by an alternating electric source. The alternating current through the winding produces a continuously changing flux or alternating flux surrounding the winding. If any other winding approaches the previous one, obviously some part of this flow will join the second. Since this flow changes continuously in its amplitude and direction, there must be a change in the flow link in the second winding or coil. According to Faraday's law of electromagnetic induction, there must be an EMF induced in the second. If the rear winding circuit is closed, there must be a current flowing through it. This is the simplest form of electric power transformer and this is the most basic of transformer working principle.
For a better understanding, we are trying to repeat the above explanation in a more brief way here. Whenever we apply alternating current to an electric coil, there will be an alternating flux that surrounds that coil. Now if we bring another coil near the first, there will be an alternate flow link with that second coil. As the flow is alternating, there will obviously be a rate of change in the flux link with respect to time in the second coil. Naturally, the emf will be induced in it according to Faraday's law of electromagnetic induction. This is the most basic concept of transformer theory.