7. Перепишите следующие предложения и переведите их на русский язык, обращая внимание на разные значения слов it; that, one. (см. Образец 3.).

1.It is advisable to link up these stations into a single network.

2.One can find many places of interest in Moscow.

3. Electrical loads or consumers in power installations are the various arrangements and installations that are used to transform electric power into mechanical, heat and chemical power, or energy.

4.The second sputnik was launched about a month after the first one.

VIII. Перепишите следующие предложения и переведите их на русский язык, обращая внимание на бессоюзное подчинение.

1.The young engineer I am working with graduated from Moscow Institute of Agricultural Engineers.

2.The invention he spoke about at the last lecture is very interesting.

3.The hostel our students live in is quite comfortable.

4.He said he had studied at the Institute of Economics and Business.

IX. Переведите текст и отработайте его чтение.

В тексте найдите:

1. предложения со сравнительной конструкцией the … the … ;

2. слово-заместитель one;

3. модальные глаголы, определите их значение.

4. причастие II.

Capacitors

A capacitor is one of the main elements of a circuit. It is used to store electric energy. A capacitor stores electric energy provided that a

voltage source is applied to it.

The main parts of a capacitor are metal plates and insulators. The function of insulators is to isolate the metal plates and in this way to prevent a short.

In the diagram one can see two common types of capacitors in use nowadays: a fixed capacitor and a variable one. The plates of a fixed capacitor cannot be moved; for this reason its capacity does not change. The plates of a variable capacitor move; its capacity changes. The greater the distance between the plates, the less is the capacity of a ca­pacitor. Variable capacitors are commonly used by radiomen; their function is to vary the frequency in the circuit. Fixed capacitors are used in telephone and radio work.

Fixed capacitors have insulators produced of paper, ceramics and other materials; variable capacitors have air insulators. Paper capacitors are commonly used in radio and electronics; their advantage is their high capacity: it may be higher than 1,000 picofarad.

Besides, electrolyte capacitors are highly in use. They also have a very high capacity: it varies from 0.5 to 2,000 microfarad. Their disadvantage is that they change their capacity when the temperature changes. They can operate without a change only at temperatures not lower than -40° C.

Common troubles in capacitors are an open and a short. A capacitor stops operating and does not store energy in case it has a trouble. A ca­pacitor with a trouble should be substituted by a new one.

X. Письменно ответьте на вопросы:

1. What is capacitor used for?

2. What are the main parts of capacitor?

3. What is the function of insulators?

4. What does the capacity of a capacitor depend on?

5. What is the difference between a fixed capacitor and a variable one?

6. What should be done in order to change a capacitor?

7. What is the relation between the value of capacity and the distance of plates?

8. What type of insulators have variable capacitors?

9. What should be done in case a capacitor has a trouble?

ВАРИАНТ 2