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4. Complete these sentences using while. Follow the model on page 13.

1. The secondary winding of a transformer is connected to the load resistance … .

2. The primary winding receives energy … .

3. A step-down transformer decreases the primary voltage … .

4. An air core transformer is used for high-frequency currents … .

5. In a step-up transformer the number of turns of the secondary winding … .

is greater than the number of turns of the primary winding … .

5. Pair work. Put these questions to your groupmate and ask him/her to answer them.

1. What is a transformer used for?

2. What does a transformer consist of?

3. What is the function of the primary winding?

4. What is the function of the secondary winding?

5. What type of transformer is called a step-up transformer?

6. What type of transformer is used for high-frequency currents?

7. What type of transformer is called a step-down transformer?

8. What type of transformer is used for low-frequency currents?

9. What is the relation between the number of turns in the windings and the value of current?

10. What are common troubles in a transformer?

11. What should be done in case a transformer has a trouble?

6. Read about current transformers. Answer the questions that follow.

Current Transformers

Current transformers are used for operating ammeters, wattmeters, and other measuring devices. They produce in the meters a current lower than the measured current but proportional to it.

Current transformers also insulate the instrument from the circuit which is being measured. This is necessary for high voltage circuits.

1. What is a current transformer used for?

2. What type of current does it produce?

Unit Thirteen [13]

1. a) Cover the right column and read the English words. Translate them into Russian and check your translation.

b) Cover the left column and translate the Russian words back into English.

alternating

[ˌɔːltəˈneɪtɪŋ]

переменный

diˈrect

прямой

diˈrection

направление

flow

[flou]

течение

necessary

[ˈnesɪsərɪ]

необходимый

to con'sider

рассматривать

use

[juːs]

использование

2. Read the words and write down their Russian equivalents:

[ˈsaɪkl]

cycle

___________________________

[taɪp]

type

___________________________

[pə ˈsekənd]

per second

___________________________

3. Put down the Russian for:

one time

____________

direct voltage source

____________

five times

____________

alternating voltage source

____________

sixty times

____________

direction of flow

____________

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