A student named Harman Toor from Delhi Public School Faridabad completed a school project on transformers under the guidance of her teacher Mr. Inderjeet Verma. The project discusses how transformers work using electromagnetic induction to transfer electrical energy between two circuits and change alternating current voltages. It describes the primary and secondary windings, magnetic flux, and Faraday's law of induction. The project also covers common uses of transformers like increasing or decreasing voltages and currents, and preventing direct current from passing between circuits. It concludes with a discussion of power losses in transformers from hysteresis, eddy currents, copper losses, and leakage flux.

1. PROJECT
ON
TRANSFORMER
Roll No. 2615346
Class: 12th -F
Delhi Public School, Faridabad

2. ACKNOWLEDGEMENT
I am very much grateful to my teacher who has given me
enrichment in preparing the project. He has given his full
devotion to prepare this project on “Transformer” at my
level. What are the related aspects and basic things? I have
mentioned all these things in precise with my full efforts. At
least, I am thankful to my teacher “Mr. Inderjeet Verma”.

3. CERTIFICATE
This is to certify that my student Harman Toor of
Class XII–F (Med.) has successfully completed this
project on "Transformer". She 'has shown keen
interest to execute this project & gained substantial
amount of knowledge on this topic.
Signature

4. INDEX
1. Introduction
2. Description
3. Uses
4. Power Losses
5. Bibliography

5. INTRODUCTION
A transformer is an electrical device that transfers electrical
energy between two or more circuits through electromagnetic
induction. Electromagnetic induction produces an
electromotive force across a conductor which is exposed to
time varying magnetic fields. Commonly, transformers are
used to increase or decrease the voltages of alternating current
in electric power applications.

6. DESCRIPTION
A varying current in the transformer's primary winding creates
a varying magnetic flux in the transformer core and a varying
magnetic field impinging on the transformer's secondary
winding. This varying magnetic field at the secondary
winding induces a varying electromotive force (EMF) or
voltage in the secondary winding due to electromagnetic
induction. Making use of Faraday's Law (discovered in 1831)
in conjunction with high magnetic permeability core
properties, transformers can thus be designed to efficiently
change AC voltages from one voltage level to another within
power networks.

7. USES
The most important uses and application of Transformer are:
 It can rise or lower the level of level of Voltage or
Current ( when voltage increases, current decreases and
vice virsa because P =V x I, and Power is same ) in an
AC Circuit.
 It can increase or decrease the value of capacitor, an
inductor or resistance in an AC circuit. It can thus act as
an impedance transferring device.
 It can be used to prevent DC from passing from one
circuit to the other.
 it can isolate two circuits electrically.

8. POWER LOSES
Hysteresis losses
Each time the magnetic field is reversed, a small amount
of energy is lost due to hysteresis within the core.
Eddy current losses
Eddy currents are induced currents set up in bulk materials
which lead to power loss in transformer
Copper Losses
Energy losses due to resistance of primary and secondary
windings
Leakage Flux
Flux is set up in air gaps rather in magnetic core which causes
power loss

9. BIBLIOGRAPHY
https://en.wikipedia.org/wiki/Transformer#Basic_principl
es
http://encyclopedia2.thefreedictionary.com/transformer