Презентация, доклад к учебному занятию по английскому языку по теме Transformers

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The Topic: Electrical MachinesWhat is an electrical machine?What are their principles of operation, construction?What are they used for?What are their types?

Слайд 1The Topic: Electrical Machines
The most prime governing thing

that holds for the existence of mankind and the universe and beyond is Energy. From the dark ages, Humans have been trying to develop means and methods to produce energy and then to transform it into another usable form. Even today, our lives are based on Energy. Energy today is now available in many forms for different uses. The most significant type of Energy that has affected our lives in a huge way is the electrical energy. Just turn around your face and you will see electrical devices everywhere around you. Electricity or the popular name for electrical energy as we call it has transformed our lives in a significant way; it has made our lives quite easy and comfortable. 

HOW IS ELECTRICITY PRODUCED?
Electricity (the inevitable thing) is produced by different types of Electric Machines and that too in different forms. The electricity that reaches our home is not a novice task; many genius minds and lots of complex and bulky electric machines are involved behind it. Then an electric machine is not only used for generation purpose it can also be used as a source of mechanical energy that is motor may it be a juicer mixer in your kitchen or the conveyer belt system in large manufacturing plants. So in the next section we will try to explain briefly about basic principle of electric machines and their types.
The Topic: Electrical Machines    The most prime governing thing that holds for the existence

Слайд 2The Topic: Electrical Machines
What is an electrical machine?
What are their principles of

operation, construction?
What are they used for?
What are their types?

The Topic: Electrical MachinesWhat is an electrical machine?What are their principles of operation, construction?What are they used

Слайд 3What is an electrical machine?
An electrical machine converts energy from one

category into another. Thereby at least one energy category
features as electric power.

An electrical machine is an energy converter in which two electric circuits have been coupled by means of a magnetic circuit.

They all comprise two electric circuits which have been coupled through a magnetic circuit.

What is an electrical machine?An electrical machine converts energy from one category into another. Thereby at least

Слайд 4Going through the basic fundamentals about principle, construction and operation of

electric machines

Figure: Tasks of electrical machines in power flow

Going through the basic fundamentals about principle, construction and operation of electric machinesFigure: Tasks of electrical machines

Слайд 5What are the principals of operation of electrical machines?
Magnetic fields

are the fundamental mechanism by which energy is converted from one form to another in motors, generators and transformers.
Two related physical principles underline the operation of generators and motors.







The electromagnetic induction

The electromagnetic reaction

discovered by Michael Faraday
in 1831

If a conductor is moved through a magnetic field, or if the strength of a stationary conducting loop is made to vary, a current is set up or induced in the conductor.

If a current is passed through a conductor located in a magnetic field, the field exerts a mechanical force on it.

discovered by André’ Ampere
in 1820

What are the principals of operation of   electrical machines?Magnetic fields are the fundamental mechanism by

Слайд 6Functional block diagram of electromechanical energy conversion devices as (A) motor,

and (B) generator
Functional block diagram of electromechanical energy conversion devices  as (A) motor, and (B) generator

Слайд 7Vocabulary:
feature – особенность, характерная черта
converter – преобразователь, конвертер
commutator – коллектор
armature –

якорь
to suggest – предлагать, предложить
ring – кольцо, фланец, хомут
bar – полоса (металла)
to pull – тянуть, притягивать
to switch – включать, выключать, переключать
drive – передача, привод
design – конструкция, чертёж, план,
to power – снабжать энергией,
to differ – различаться, отличаться
to rotate – 1. вращаться; 2. чередоваться
to create – творить, создавать


Vocabulary:feature – особенность, характерная чертаconverter – преобразователь, конвертерcommutator – коллекторarmature – якорьto suggest – предлагать, предложитьring –

Слайд 8Motors and generators’ structure

Motors and generators’ structure

Слайд 9A simple electromagnet consisting of a coil of insulated wire wrapped

around an iron core

The Armature  from a small DC fan motor

A simple electromagnet consisting of a coil of insulated wire wrapped around an iron core The Armature

Слайд 10Electrical Machines










Bearers of electric circuits to one another
rigid
flexible
Stationary

electrical machines

Rotating electrical machines

synchronous

asynchronous

commutators

transformers

DC Machines

Single-phase

Three-phase

Electrical Machines   Bearers of electric circuits to one anotherrigidflexibleStationary electrical machinesRotating electrical machinessynchronousasynchronouscommutatorstransformersDC MachinesSingle-phaseThree-phase

Слайд 11What are these?

What are these?

Слайд 12The subject: Transformers
Lesson Tasks:
To check up our homework;

To get information about

transformers;
to find out what is a transformer;
to learn about it’s construction;
to know about the types of transformers;



The subject: TransformersLesson Tasks:To check up our homework;To get information about transformers;to find out what is a

Слайд 13Warming-up

Warming-up

Слайд 14Checking-up the h/w / Giving marks

Checking-up the h/w / Giving marks

Слайд 15Checking-up the Home work / Keys

Checking-up the Home work / Keys

Слайд 16Checking-up the h/w / Giving marks

Checking-up the h/w / Giving marks

Слайд 17Text working “Transformers”
Vocabulary:


Text working “Transformers”Vocabulary:

Слайд 18Transformers’ Types
What types of transformers are described in the text?

Transformers’ TypesWhat types of transformers are described in the text?

Слайд 19What is the work principle of a step-up transformer ?

What is the work principle of  a step-up transformer ?

Слайд 20 What is the work principle of a step-down transformer ?

What is the work principle of  a step-down transformer ?

Слайд 21What is the work principle of an air-core transformer ?

What is the work principle of  an air-core transformer ?

Слайд 22 What is the work principle of an iron-core transformer ?

What is the work principle of  an iron-core transformer ?

Слайд 23The subject: Transformers
Lesson Tasks:
To check up our homework;

To get information about

transformers;
to find out what is a transformer;
to learn about it’s construction;
to know about the types of transformers;



The subject: TransformersLesson Tasks:To check up our homework;To get information about transformers;to find out what is a

Слайд 24Transformers’ Application
1. Distribution transformers are generally used in power distribution and

transmission systems.
2. Power transformers are used in electronic circuits and come in many different types and applications.
3. Control transformers are generally used in circuits that require constant voltage or constant current with a low power or volt-amp rating.
4. Auto transformers are generally used in low power applications where a variable voltage is required.
5. Isolation transformers are normally low power transformers used to isolate noise from or to ground electronic circuits.
6. Instrument potential and instrument current transformers are used for operation of instruments such as ammeters, voltmeters, watt meters, and relays used for various protective purposes.
Transformers’ Application1. Distribution transformers are generally used in power distribution and transmission systems. 2. Power transformers are

Слайд 25Transformers’ Application

Transformers’ Application

Слайд 26Complex Object
The Subject
The Predicate
The Object (a Noun or a Pronoun in

an Object case)

The Infinitive
(with or
without to)

The Rest Part of the Sentence

Complex Object

We

consider

a transformer

to be

an electrical machine.

She

wants

him

to study

English .

Complex ObjectThe SubjectThe PredicateThe Object (a Noun or a Pronoun in an Object case) The Infinitive (with

Слайд 27Complex Object
После глаголов: желания
(wish, want, like, would like), предположения (expect, seem,

consider, appear, suppose, believe), сообщения/информации (know, think, claim, report, declare, show, find)

После глаголов  физическое восприятия и ощущения 
(notice, see, watch, hear, listen to, observe, feel, ),
а также make и let

The Subject

The Object (a Noun or
a Pronoun
in an Object case)

to +
The Infinitive

The Infinitive

The Object (a Noun or
a Pronoun
in an Object case)

Complex ObjectПосле глаголов: желания (wish, want, like, would like), предположения (expect, seem, consider, appear, suppose, believe), сообщения/информации (know,

Слайд 28Complex Subject
The Subject
The Predicate
The Infinitive

The Rest Part of the Sentence
Complex

Subject

The current

Is known

to consist

of moving electrons.

She

Is supposed

to work

at this plant.

Complex SubjectThe SubjectThe PredicateThe Infinitive The Rest Part of the SentenceComplex SubjectThe currentIs knownto consist of moving

Слайд 29Complex Subject
Сказуемое-глагол в пассивном залоге: to say, to report, to

announce, to believe, to suppose, to think, to state, to expect, to know, to consider, to see, to hear

Сказуемое в активном залоге: to seem, to appear, to prove, to turn out, to happen, to chance.

3) Сказуемое-глагол to be в выражениях:
to be likely, to be unlikely, to be certain, to be sure

The Subject

to +
The Infinitive

Complex Subject Сказуемое-глагол в пассивном залоге: to say, to report, to announce, to believe, to suppose, to

Слайд 30Complex Object / Complex Subject
We
suppose
him

at this plant.
Complex Subject
He
Is supposed
to work


at this plant.

to work

Complex Object

Complex Object / Complex SubjectWesupposehim at this plant.Complex SubjectHeIs supposedto work at this plant.to work Complex Object

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