- •I. Read the text. The Nature of Electricity
- •I. Read the text. Electric current
- •II. Guess the meaning of the following international words:
- •III. Give the English equivalents for the words and word combinations below:
- •IV. Give Russian equivalents for the following:
- •V. Say whether these sentences are true or false:
- •VI. Fill in the blanks, using the words from the box:
- •Direct current, solids, conduct, electric current, liquids,
- •VII. State the questions to the underlined words:
- •VIII. Say some sentences about the types of electric current and its properties. Unit 3
- •I. Read the text.
- •Effects produced by a current
- •III. Guess the meaning of the following international words:
- •IV. Insert words and expressions:
- •V. Choose the correct translation:
- •VI. Answer the questions:
- •VIII. Speak about the principal effects of an electric current, using the text and chart above. Unit 4
- •I. Read the text.
- •Electric Circuits
- •II. Guess the meaning of the following international words:
- •III. Give the English equivalents for the following words and word combinations:
- •IV. Say whether these sentences are true or false:
- •V. Complete the sentences using the text:
- •VI. Answer the questions:
- •VII. Talk on the types of electric circuits. Unit 5
- •I. Read the text.
- •Alternating Current
- •II. Guess the meaning of the following international words:
- •IV. Give the English equivalents for the words below:
- •I. Read the text. Conductors and insulators
- •Give the Russian equivalents for the words and word combinations below:
- •Find in the text the sentences with the following related words and translate them:
- •State questions to the underlined words:
- •Say whether these sentences are true or false:
- •VII. Talk on the conducting ability of various substances and their application in electrical engineering. Use the table in Task IV. Unit 7
- •I. Read the text.
- •Semiconductors
- •II. Give the English equivalents for the words and word combinations below:
- •III. Guess the meaning of the following international words:
- •V. Insert words and expressions:
- •VI. Answer the questions:
- •VII. Talk on the properties of semiconductors and their practical application. Unit 8
- •I. Read the text.
- •Electricity and magnetism text 1 Electromotive Force
- •Text 2 Electromagnetic Induction
- •Text 3 electromotive force and resistance
- •I. Read the text. Dynamos
- •II. Fill in the gaps with the words given below:
- •III. Find the Russian equivalents for the following English words and word combinations:
- •IV. Answer the questions.
- •V. Talk on the dynamo action. Unit 10
- •I. Read the text.
- •Generators
- •II. Give the Russian equivalents for the following English words and word combinations:
- •III. Fill in the blanks
- •V. Speak on the following points:
- •Unit 11
- •I. Read the text. Main Structural Elements of a d. C. Machine
- •II. Translate the following phrases, using the given variants of translation.
- •IV. Arrange synonyms in pairs and memorize them:
- •V. Write out the names of the machine parts and describe their operational characteristics. Unit 12
- •I. Read the text.
- •The Alternator
- •Unit 13
- •I. Read the text. The Induction Motor
- •VI. Discuss the following points:
- •Unit 14
- •I. Read the text.
- •Types of Induction Motors
- •Single-phase motor
- •Text 2 three – phase induction motor
- •III. Translate the sentences from the text paying attention to the Nominative Absolute Participle Constructions:
- •IV. Answer the following questions:
- •V. Work out the plan of the text.
- •VI. State 5 questions to the text. Unit 15
- •I. Read the text.
- •Transformers
- •II. Guess the meaning of the following international words:
- •Unit 16
- •I. Read the text. Types of transformers
- •II. Guess the meaning of the following international words:
- •III. Give the English equivalents for the words below:
- •Unit 17
- •I. Read the text. Measurements of Electric Values
- •II. Guess the meaning of the following international words:
- •III. Give the English equivalents to the words below:
- •IV. Translate into Russian the words and expression from the text:
- •V. Insert the words:
- •VI. Answer the questions:
- •VII. State questions to the underlined words:
- •VIII. Topics for discussion:
- •Unit 18
- •I. Read the text. Main Types of Ammeters and Voltmeters
- •VII. Topics for discussion:
- •Unit 19
- •I. Read the text. Electrical Measuring Instruments and Units
- •VII. Describe different types of measuring instruments and units, using the table in Task V.
- •George symon ohm
- •Text 3 Faraday's Law
- •Text 4 emil lenz. Lenz's Law
- •Text 5 Kirchhoff's Laws
- •Text 6 a Great Invention of a Russian Scientist
- •Text 7 charles coulomb
- •Text 8 andre marie ampere
- •Text 9 james clerc maxwell
- •Text 10 World Brightest Electric Lamps
- •Text 11 early history of electricity
- •Text 12 from the history of electricity
- •Text 13 Nature of Electricity
- •Text 14 atmospheric electricity
- •Text 15 magnetism
- •Text 16 magnetic effect of an electric current
- •Text 2 power transmission
- •Text 3 hydroelectric power-station
- •Text 4 nuclear power plant
- •Text 5 Electronics and Technical Progress
- •Text 6 Protection and control equipment
- •Text 7 The Nucleus
- •Text 8 What Is An Electron?
- •Text 9 Electrons and electronic charges
- •Text 10 Polarity
- •Text 11 Energy Conversion
- •Power engineering dictionary
- •Список использованной литературы
- •400131, Г. Волгоград, пр. Ленина, 28, корп. 1.
- •403874, Г. Камышин, ул. Ленина, 5, каб. 4.5
I. Read the text.
The Alternator
The alternator is an electric machine for generating an alternating current by a relative motion of conductors and a magnetic field. The machine usually has a rotating field and a stationary armature. In a synchronous alternator the magnetic field is excited with a direct current. The direction of an induced e.m.f. is reversed each time when a conductor passes from a pole of one polarity to a pole at another polarity. Most machines of this type are used for lighting and power, but there are alternators with a revoking armature and a stationary field. They are used in small sizes mostly for special purposes.
Any electrical machine is reversible. When a machine is driven by a source of mechanical power, it works as a generator and delivers electrical power. If it is connected to a source of electrical power, it produces mechanical energy, and operates as a motor. The alternator may also be operated as a motor.
The a.c. generator, or alternator, does not differ in principle from the d.c. generator. The alternator consists of a field structure and an armature. The field structure is magnetized by a field winding carrying a direct current. An electromotive force is generated in tine winding of the armature. In alternators the field is usually the rotating element and the armature is stationary. This construction has a number of advantages. Only two rings are needed with a rotating field. These rings carry only a relatively light field current, at a voltage generally of 125, and seldom exceeding 250. The insulation of such rings is not difficult. A stationary armature requires no slip rings. The leads from the armature can be continuously insulated from the armature winding to the switchboard, leaving no bare conductor. The alternator with a rotating field may be further divided into the vertical and the horizontal types.
The vertical type is usually applied for large water-wheel generators where it is desirable to mount the water turbine below the generator. The more common horizontal type is used with diesel and steam engine drive. A low-speed alternator of this type is suitable for a diesel engine drive, a high speed alternator is suitable for a steam turbine drive.
II. Form nouns, denoting devices with the help of the suffix -or. Translate them.
To alternate, to commute, to conduct, to generate.
III. Read the text and write out the key words, characterizing the alternator.
IV. Translate the following word combinations paying attention to the Participle II.
1) The leads from the armature can be continuously insulated from….. ; 2) the vertical type of alternator applied for large water-wheel generator; 3) alternators with a revoking armature and a stationary field used in small sizes mostly for special purposes; 4) a machine driven by a source of mechanical power; 5) the direction of an induced e.m.f. …
V. State 5 questions to the text.
VI. Points for discussion:
1. The structure of the alternator.
2. The application of the alternator.