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Exercises

1. Learn the following active words:

alternator генератор переменного тока

armature якорь

calculate считать

equip оснащать, оборудовать

operate работать, функционировать

revolutions per minute обороты в минуту

rotate вращаться

shunt шунт, параллельная цепь

thermo-electric station термоэлектростанция

tur­bine турбина

winding обмотка

2. Translate the following sentences:

1.Heat developed in a transmission line or a generator is a needless waste of power. 2. An electric lamp uses the light given off by its filament heated by the current. 3. The experiments made by Oersted attracted Ampere’s attention. 4. Electric power stations supplying power on a large scale are equipped with large alternators.

3.Translate the following sentences and combine the principal and the subordinate clauses with suitable conjunctions:

1. There is a great number of engineering problems the Russian scientists work at. 2. It is quite impossible to name a scientific problem Lomonosov did not turn his attention to. 3.There are many electric appliances we cannot do without. 4.The experiment I told you about will take much time.

4. Answer the following questions:

1. Do you want to translate this article? 2. Do you want me to translate this article? 3. Do you know this scientist? 4. Do you know this scientist to have explained the new phenomenon? 5. Did you hear my report? 6. Did you hear my friend make a report? 7. Did you see my brother? 8. Did you see my brother enter the room?

5. Form adjectives using the suffixes -able, -fut, -less, -ous:

control, continue, danger, value, replace, need, power, peace, use, life

6. Form adverbs using the suffix -ly:

exact, electrical, general, gradual, negative, natural, opposite, previous, usual, easy

7. Read the following abbreviations:

а. c, d.c, r.p.m., e.m.f., m.m.f., 317°F, 45°C, i.e.

8. Translate the following sentences:

1. Чем сильнее магнитное поле, тем больше ток. 2. Чем больше ток, текущий по проводнику, тем выше температура проводника. 3. Чем меньше труба, тем меньше воды про­ходит через нее. 4. Чем короче проводник, тем меньше со­противление проходящему току. 5. Чем больше скорость движения между магнитным полем и проводниками, тем больше ток.

9. Define the following terms:

1. electromotive force; 2. electric circuit; 3. heating effect of an electric current; 4. magnetic effect of an electric current; 5. electromagnet; 6. generator

10. Work in pairs. Put questions to your fellow-student and let him answer them.

  1. if batteries can supply light, heat and power on our modern large scale.

  2. if the electromagnet is a temporary magnet provided by electricity.

  3. if the electromagnet is lifeless unless the electric cur­rent flows through the coil.

  4. if the iron core will act as a magnet as long as the current continues to pass along the winding.

  5. if the alternator provides a.c.

6. if the generator must be turned by some outside source of mechanical power.

11. Form five sentences, combining suitable parts of the sentence given in Columns I and II:

I

II

Electric circuit

is a temporary magnet proved by electricity.

e.m.f.

is an electrical appliance used in our daily life.

Heat engine

is a path to be followed by the current from the source a back to the source.

Iron

is the force that makes electrons move along a conductor

electromagnet

is a device by means of which heat is turned into work

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