1. Ответьте на вопросы

1. What is main thing for linking the three circuits electrically with the consequence that the number of conductors essential for?

2. Which three rear ends of the turns should be connected with the rear ends of the resistances?

3. How many rear ends of the resistances do need to use together with the rear ends of the turns?

4. What is the major reason for transmitting the power of conductors? 5. Where do three generator windings usually connect together to conductors?

6. In which situation a phase difference of 120° will be balanced?

7. What is position between balanced three-phase systems and the three currents?

8. What is a system of links which authorizes the service of a three-phases and three single-phases load at the same time?

9. What is the universal practice to score each particular phase by a unique color?

10. When do the three phases color red, white (or yellow), and blue in that order?

2. Найдите синонимы

Individual, possible, necessary, indispensable, likely, common, rear, together, reverse, forward, mutual, convenient, personal, build, comfortable, back, jointly, onward

Найдите антонимы

Individual, possible, necessary, together, general, reverse, forward convenient, impossible, group, unnecessary, specific, apart, posterior, normal, inconvenient

3. Переведите следующие слова и выражения на английский язык

1. цепь. 2. Проводник.  3. Электричество. 4. Расположение. 5. Сопротивление.

4. Переведите следующие слова и выражения на русский язык

1. Three-Wire Transmission.  2. Current.  3. Three-Phase Four-Wire System.  4. Single-phase load.  5. Colour scheme.

Non-traditional renewable sources of energy

It is known that much is being done in the world today for the development ofnon-traditional sources of energy. Without them the Earth cannot support its present population of 5 billion people and probably 8 billion people in the 21st century.

Now we are using traditional powerhouses, that is, oil, natural gas, and coal and water power with the consumption of more than 50 billion barrels per year. It isevident that these sources are not unlimited.

That is why it is so important to use such renewable sources of energy as the sun, wind, geothermal energy and others. Research is being carried out in these fields.

One of the most promising (перспективный) research is the development of power stations with direct transformation of solar energy into electricity on the basis of photo-effect. It was Russia that was the first in the world to develop and test a photoelectric battery of 32,000-volts and effective area of only 0.5 sq.m., which made it possible to concentrate solar radiation. This idea is now being intensively developed in many countries.

However, the efficiency of a solar power station is considerably reducedbecause of the limited time of its work during the year. But it is possible to improve the efficiency of solar power stations by developing different combinations of solar power stations and traditional ones – thermal, atomic and hydraulic. Today some engineers are working at the problem of developing electric power stations with the use of a thermal-chemical cycle. It will operate on products of the transformation of solar energy, whereas me «solar» chemical reactor uses CO2 and water steam of the thermal power station. The result is that we have a closed cycle.

It is planned that plants working on the energy of the solar heat provided by thesun will be built on a larger scale.That different wind energy plants are being developed is also well-known.These energy plants can be small (of several kilowatts) and large powerful systems.It is important that all these advances in developing new sources of energy andimproving the old ones help to solve the energy problem as a whole and they do not have negative effects on the environment.