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2)Употребите глагол в скобках в правильной форме:

1. The experiment (repeat) many times.

2. The power which (radiate) as light is almost three times as great as that radiated as heat.

3. It (know) that iron molecules are magnets at all times.

4. Under ordinary room lightning the resistance of transistors (decrease) millions of times.

5. Ruby crystals about ten centimetres long can (intensify) light ten times.

6. The density of a semiconductor laser radiation (be) hundreds of times as great as that of the ruby laser.

7. The power which (transmit) along a wire is the product of the voltage times the amperage.

3) Завершите предложение, используя правильный вариант:

1. A nuclear reactor is used in a) wind-power plants.

b) atomic power plants.

2. A nuclear reactor is cooled a) water circulating in tubes.

by b) oil circulating in tubes.

3. Water is passed into the re­actor a) at a low pressure.

b) at a high pressure.

4. High pressure a) activates boiling of water.

b) prevents boiling of water.

5. Atomic power plants a) pollute the air with dust and smoke.

b) do not pollute the air with dust and smoke.

6. Circulating water flows a) inside the heat exchangers.

b) outside the heat exchangers.

7. Attending personnel is a) thick concrete walls.

shielded by b) thick metal walls.

4) Ответьте на вопросы:

1. What are the main units of an atomic power plant?

2. By what means is the nuclear reactor cooled?

3. At what pressure does the water pass into the reactor?

5)Ответьте, верны ли следующие утверждения:

a) Atomic power plants do not pollute the air with dust and smoke

б) Circulating water flows inside the heat exchangers.

в) A nuclear power plant releases fission products.

г) The waste products are disposed in a shielded cylinders.

д) The fission products are confined within open tubes.

3. Control text

Прочитайте текст и ответьте на вопросы:

Solar Energy

The Sun radiates to our planet great amounts of energy. This energy input fuels all our biological processes and is the original source for hydropower, wind power, and fossil fuel resources. Environmentally and economically, the Sun is our greatest energy source. Why then is the direct use of solar energy so limited for industrial, domestic, com­mercial, and transportation purposes?

First, solar energy arrives in small quantities - only about one kW per square meter; second, it does not arrive at all during night hours. Third, it is very difficult to transform it into useful energy forms except low-grade heat.

Dynamo

Dynamo is a common device for converting mechanical energy into electric energy. This process depends on the fact that if an electrical conductor moves across a magnetic field, an electric current flows in the conductor.

Usually a dynamo includes an electromagnet, called the field magnet, between the poles of which a suitable conductor, usually in the form of a coil, called the armature, is rotated. The mechanical energy of the rotation, in the form of a current in the armature, is thus converted into electric energy.

1. What device is described in the text?

2. What types of the device do you know?

3. Why is the direct use of solar energy limited nowadays?

Unit IV

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