This document describes a physics investigatory project on transformers. It discusses the basic principles of transformers, including how they work based on mutual induction to convert alternating voltages. It outlines the objective to investigate the relationship between input/output voltages and primary/secondary coil turnings. The document provides details on the experimental procedure, apparatus used, observations made, sources of error, conclusions drawn, and bibliography.
The transformer is a device used for converting a low alternating voltage to a high alternating voltage or vice-versa. A Transformer based on the Principle of mutual induction according to this principle, the amount of magnetic flux linked with a coil changing, an e.m.f is induced in the neighbouring coil.
The transformer is a device used for converting a low alternating voltage to a high alternating voltage or vice-versa. A Transformer based on the Principle of mutual induction according to this principle, the amount of magnetic flux linked with a coil changing, an e.m.f is induced in the neighbouring coil.
physics non working investigatory project tranformerakashgauravr
investigatory project work physics for transformer 100%non working and ensurance of gettin ful marks in practicle in investigatory projesct ,hopeful u enjoy....
this is my investigatory file I made for class XII on the topic electromagnetic induction (EMI).there 2 document with same name 1 is in pdf and another one is in docx.
Its a simple project for class 12th science students. This project is collected from various sources including Google, Wikipedia and Slideshare, Youtube and many more.
Step-down transformer Physics project Class 12 CBSE FinalMuhammad Jassim
FULL MARK WITH THIS. EASY NO WORY. QUESTIONS FOR VIVA WILL ALSO BE EASY SINCE THE PROJECT IS EASY.
Step-down transformer Physics project Class 12 CBSE Final
Also called: break bone fever
Dengue viruses are the arboviruses capable of infecting humans and causing disease.
It is a arthropod borne viral disease. Of all the arthropod borne diseases dengue fewer is most commonCBSE class 12th physics Investigatory ProjectAlso called: break bone fever
Dengue viruses are the arboviruses capable of infecting humans and causing disease.
It is a arthropod borne viral disease. Of all the arthropod borne diseases dengue fewer is most common
physics non working investigatory project tranformerakashgauravr
investigatory project work physics for transformer 100%non working and ensurance of gettin ful marks in practicle in investigatory projesct ,hopeful u enjoy....
this is my investigatory file I made for class XII on the topic electromagnetic induction (EMI).there 2 document with same name 1 is in pdf and another one is in docx.
Its a simple project for class 12th science students. This project is collected from various sources including Google, Wikipedia and Slideshare, Youtube and many more.
Step-down transformer Physics project Class 12 CBSE FinalMuhammad Jassim
FULL MARK WITH THIS. EASY NO WORY. QUESTIONS FOR VIVA WILL ALSO BE EASY SINCE THE PROJECT IS EASY.
Step-down transformer Physics project Class 12 CBSE Final
Also called: break bone fever
Dengue viruses are the arboviruses capable of infecting humans and causing disease.
It is a arthropod borne viral disease. Of all the arthropod borne diseases dengue fewer is most commonCBSE class 12th physics Investigatory ProjectAlso called: break bone fever
Dengue viruses are the arboviruses capable of infecting humans and causing disease.
It is a arthropod borne viral disease. Of all the arthropod borne diseases dengue fewer is most common
Para fazer o download visite meu blog de fotos de Carros antigos e curiosos:
http://henry-mymobileblog.blogspot.com.br/2010/04/catalogo-de-carburadores-weber-brasil.html
A soja tem grande importância econômica no Brasil, especialmente na região Centro-Oeste. A cultura é acometida por um grande número de doenças, e esse número aumenta a cada ano. Por isso, conhecer as características das principais doenças e os métodos de controle disponíveis para controlá-las é de extrema importância. Dentre os métodos de controle, o químico é o mais utilizado, em especial os fungicidas. Esse controle químico, porém, só será eficiente se observarmos as tecnologias de aplicação para usá-las de forma eficiente.
transformers is a project based on physics which explores its working, uses, loses and many more.... please do visit the project for good sense of understanding
Class 12 Investigatory project, Presentation, Class 12 Physics Project presentation, Class 12 physics Project,CBSE Class 12 physics project, Transformers
https://www.slideshare.net/EligetiVishnu/physics-investigatory-electromagnetic-inductionhttps://www.slideshare.net/EligetiVishnu/physics-investigatory-electromagnetic-inductionhttps://www.slideshare.net/EligetiVishnu/physics-investigatory-electromagnetic-inductionhttps://www.slideshare.net/EligetiVishnu/physics-investigatory-electromagnetic-inductionvvhttps://www.slideshare.net/EligetiVishnu/physics-investigatory-electromagnetic-inductionhttps://www.slideshare.net/EligetiVishnu/physics-investigatory-electromagnetic-inductionvhttps://www.slideshare.net/EligetiVishnu/physics-investigatory-electromagnetic-induction Area 51 is the common name of a highly classified United States Air Force (USAF) facility within the Nevada Test and Training Range. A remote detachment administered by Edwards Air Force Base, the facility is officially called Homey Airport (ICAO: KXTA, FAA LID: XTA)[1] or Groom Lake (after the salt flat next to its airfield). Details of its operations are not made public, but the USAF says that it is an open training range,[2] and it is commonly thought to support the development and testing of experimental aircraft and weapons systems.[3][2] The USAF and CIA acquired the site in 1955, primarily for flight testing the Lockheed U-2 aircraft.[4]
The intense secrecy surrounding the base has made it the frequent subject of conspiracy theories and a central component of unidentified flying object (UFO) folklore.[5][6] It has never been declared a secret base, but all research and occurrences in Area 51 are Top Secret/Sensitive Compartmented Information (TS/SCI).[7] The CIA publicly acknowledged the base's existence on 25 June 2013, following a Freedom of Information Act (FOIA) request filed in 2005 and declassified documents detailing its history and purpose.[8]
Area 51 is located in the southern portion of Nevada, 83 miles (134 km) north-northwest of Las Vegas. The surrounding area is a popular tourist destination, including the small town of Rachel on the "Extraterrestrial Highway".Area 51 is the common name of a highly classified United States Air Force (USAF) facility within the Nevada Test and Training Range. A remote detachment administered by Edwards Air Force Base, the facility is officially called Homey Airport (ICAO: KXTA, FAA LID: XTA)[1] or Groom Lake (after the salt flat next to its airfield). Details of its operations are not made public, but the USAF says that it is an open training range,[2] and it is commonly thought to support the development and testing of experimental aircraft and weapons systems.[3][2] The USAF and CIA acquired the site in 1955, primarily for flight testing the Lockheed U-2 aircraft.[4]
The intense secrecy surrounding the base has made it the frequent subject of conspiracy theories and a central component of unidentified flying object (UFO) folklore.[5][6] It has never been declared a secret base, but all research and occurrences in Area 51 are Top Secret/Sensitive Compartmented Information (TS/SCI).[7
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
How to Make a Field invisible in Odoo 17Celine George
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2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
3. INDEX
1.CERTIFICATE OF EXCELLENCE
2. ACKNOWLEDGEMENT
3. AIM OF PROJECT
4. INTRODUCTION
5. THEORY
6. APPARATUS REQUIRED
7. PROCEDURE FOLLOWED
8. OBSERVATION
9. CONCLUSION
10. PRECAUTION
11. BIBLIOGRAPHY
4. INTRODUCTION
The transformer is a device used for converting a low
alternating voltage to a high alternating voltage or vice-versa.
A Transformer based on the Principle of mutual induction according
to this principle, the amount of magnetic flux linked with a coil
changing, an e.m.f is induced in the neighboring coil.
A transformer is an electrical device which is used for
changing the A.C. voltages. A transformer is most widely used device
in both low and high current circuit. As such transformers are built
in an amazing strength of sizes. In electronic, measurement and
control circuits, transformer size may be so small that it weight only
a few tens of grams where as in high voltage power circuits, it may
weight hundred of tones.
In a transformer, the electrical energy transfer from one
circuit to another circuit takes place without the use of moving
parts.
A transformer which increases the voltages is called a
step-up transformer. A transformer which decreases the A.C.
voltages is called a step-down transformer.
Transformer is, therefore, an essential piece of
apparatus both for high and low current circuits.
OBJECTIVE
To investigate the relation between the ratio of –
1. Input and output voltage.
2. Number of turnings in the secondary coil and primary coil of
a self made transformer.
5. When an altering e.m.f. is supplied to the primary coil p1p2, an
alternating current starts falling in it. The altering current in the
primary produces a changing magnetic flux, which induces altering
voltage in the primary as well as in the secondary. In a good-
transformer, whole of the magnetic flux linked with primary is also
linked with the secondary, and then the induced e.m.f. induced in each
turn of the secondary is equal to that induced in each turn of the
primary. Thus if Ep and Es be the instantaneous values of the e.m.f.’s
induced in the primary and the secondary and Np and Ns are the no. of
turns of the primary secondary coils of the transformer and
dф / dt = rate of change of flux in each turnoff
the coil at this instant, we have
Ep = -Np dф/dt _______________ (1) and
Es = -Ns dф/dt _______________ (2)
Since the above relations are true at every instant, so by dividing2 by
1, we get
Es / Ep = - Ns / Np ______________ (3)
6. As Ep is the instantaneous value of back e.m.f induced in the
primary coil p1, so the instantaneous current in primary coil is
due to the difference (E – Ep ) in the instantaneous values of the
applied and back e.m.f. further if Rp is the resistance o, p1p2 coil,
then the instantaneous current Ip in the primary coil is given
by
Ip = E – Ep / Rp
E – Ep = Ip Rp
When the resistance of the primary is small, Rp Ip can be
neglected so therefore
E – Ep = 0 or Ep = E
Thus back e.m.f = input e.m.f
Hence equation 3 can be written as
Es / Ep = Es / E = output e.m.f / input e.m.f = Ns / Np = K
Where K is constant, called turn or transformation ratio.
7. IN A STEP-DOWNTRANSFORMER
Es < E so K < 1, hence Ns < Np
If Ip = value of primary current at the same instant
And Is = value of secondary current at this instant, then
Input power at the instant = Ep Ip and
Output power at the same instant = Es Is
If there are no losses of power in the transformer, then
Input power = output power Or
Ep Ip = Es Is Or
Es / Ep = Ip / Is = K
8. IN A STEP-UP TRANSFORMER
Es > E so K > 1, hence Ns > Np
As, k > 1, so Ip > Is or Is < Ip
i.e. current in secondary is weaker when secondary
voltage is higher.
Hence, whatever we gain in voltage, we lose in current in
the same ratio.
Similarly it can be shown, that in a step down
transformer, whatever we lose in voltage, we gain in
current in the same ratio.
Thus a step up transformer in reality steps down the
current & a step down transformer steps up the current.
9. EFFICIENCY
Efficiency of a transformer is defined as the ratio of output power to
the input power.
i.e.
η = output power / input power = Es Is / Ep Ip
Thus in an ideal transformer, where there is no power losses, η = 1.
But in actual practice, there are many power losses; therefore the
efficiency of transformer is less than one.
ENERGY LOSSES
Following are the major sources of energy loss in a transformer:
1. Copper loss is the energy loss in the form of heat in the copper
coils of a transformer. This is due to joule heating of conducting
wires.
2. Iron loss is the energy loss in the form of heat in the iron core of
the transformer. This is due to formation of eddy currents in iron
10. core. It is minimized by taking laminated cores.
11. 3. Leakage of magnetic flux occurs inspite of best insulations.
Therefore, rate of change of magnetic flux linked with each turn of
S1S2 is less than the rate of change of magnetic flux linked with each
turn of P1P2.
4. Hysteresis loss is the loss of energy due to repeated
magnetization and demagnetization of the iron core when A.C. is fed
to it.
5. Magnetostriation i.e. humming noise of a transformer.
APPARATUS REQUIRED
IRONROD
COPPERWIRE
13. CIRCUIT DIAGRAM
PROCEDURE
1. Take thick iron rod and cover it with a thick paper and wind a
large number of turns of thin Cu wire on thick paper (say 60).
This constitutes primary coil of the transformer.
14. 2. Cover the primary coilwith a sheet of paper and wound
relativelysmaller number of turns (say 20) of thick copper wire
on it. This constitutes the secondary coil. It is a step down
transformer.
3. Connect p1, p2 to A.C main and measure the input voltage
and current using A.C voltmeter and ammeter respectively.
4. Similarly, measure the output voltage and current through
s1and s2.
5. Now connect s1and s2to A.C main and again measure
voltage and current through primary and secondary coil of step
up transformer.
6. Repeat all steps for other self made transformers by
changing number of turns in primary and secondary coil.
USES OF TRANSFORMER
A transformer is used in almost all a.c. operations-
In voltage regulator for T.V., refrigerator, computer,
air conditioner, etc.
A step down transformer is used for welding purposes.
A step down transformer is used for obtaining
large current.
A step up transformer is used for the production of X-
Rays and NEON advertisement.
Transformers are used in voltage regulators and
stabilized power supplies.
Transformers are used in the transmissions of a.c.
over long distances.
Small transformers are used in Radio sets, telephones,
loud speakers and electric bells etc
15. SOURCES OF ERROR
1. Values of current can be changed due to heating
effect.
2. Eddy current can change the readings.
CONCLUSION
1. The output voltage of the transformer across the secondary
coil depends upon the ratio (Ns/Np) with respect to the input
voltage
2. The output voltage of the transformer across the secondary
coil depends upon the ratio (Ns/N p) with respect to the input
voltage
3. There is a loss of power between input and output coil
of a transformer.
___________________________________________________________
_____________
___________________________________________________________
_____________
PRECAUTIONS
16. 1.Keep safe yourself from high voltage.
2. While taking the readings of current and voltage the A.C
should remain constant.