VIII. * Прочтите и переведите сочетания слов:

1. a deflecting pointer; 2. the deflection of rays; 3. to point the direction; 4. a point on the diagram; 5. a thermometer's scale; 6. readings of the scale; 7. actual readings of the scale; 8. negative terminals; 9. connected with negative terminals; 10. to disturb the reception; 11. to disturb radio communication; 12; air disturbances; 13. a turning armature; 14. an iron armature; 15. a magnetic coil; 16. through this distance; 17. through the field; 18. turns of a coil

IX. Прочтите и переведите предложения:

1. The length of the antenna should be such that it will ope­rate on its fundamental wave-length.

2. When the ammeter is used, the circuit should be opened at one point and the terminals of the meter should be connected to it.

3. A rheostat is used to change the resistance of circuits, and in this way to vary the value of current.

4. The most common way of converting sound into electricity is to use a crystal microphone or a ceramic one.

5. To determine the volume of a gas at a definite temperature is not difficult.

6. One should know that voltage applied to your body may result in an electric shock.

7. The value of the resistance to be used will depend on the amount of plate current that passes through the rectifier.

8. To convert heat directly into electricity was the main purpose.

9. The amount of energy to be released by this radioactive material will be easily calculated.

10. The property of a quartz crystal is to change its dimen­sions under the^: influence of electricity.

11. To determine the parameters of the upper atmosphere was the main purpose of investigation.

12. The students had to make an armature and use it in the laboratory experiment.

13. One should know that a resistor is one of the most common elements of any circuit.

14. The sensitivity of a new radio-set is better than that of an old one.

X. * Укажите дробью номер вопроса (числитель) и номер предложения из текста, которое является ответом на него (знаменатель):

1. How should the ammeter be connected?

2. What is a voltmeter?

3. Why must a voltmeter have a very high resistance?

4. What resistance must an ammeter have?

5. For what purpose is the ammeter used?

6. What do the readings on the scale of the ammeter show?

7. How is the deflection of the ammeter measured?

8. In what way is the ammeter placed with the circuit in actual use?

XI. Переведите, не пользуясь словарем:

A Portable Electric Generator

To convert heat directly into electricity was one of the main tasks of scientists. The usual way was to produce electricity by means of generators and get their power from steam¹ or water turbines. Now the generator converting heat directly into elec­tricity has been developed. It is small in size and can produce only a small amount of energy. One can use this generator as a source of power for instruments carried in earth satellites. The generator weighs 2.3 kg, it has a diameter of 12 cm and a height of 14 cm. It can convert radiation from a radio-active material — Polonium 210— into heat, equivalent to 5 watts of electricity. It has no moving parts and operates by means of thermo-couples². A thermo-couple is made up of semiconduc­tors (two different metals that are good conductors of electricity but bad conductors of heat). To produce current one should heat these two metals and connect a wire to the two open ends³. The amount of energy to be released by a radio-active material is calculated in terms of half-lives.

Polonium 210 has a half-life of 140 days. It means that at the end of 140 days the radio-activity of polonium decreases, and the electrical power produced by it decreases, too, from 5 watts to 3 watts. Many other radio-active materials can be used instead of⁵ polonium.