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6. Complete the sentences using while. Follow the model on page 13.

1. The value of a fixed resistor is constant … .

2. Current-carrying capacity is given in amperes … .

3. The lower the value of current, the lower is the temperature of a resistor … .

4. An electric source produces energy … .

7. Pair work. Put these questions to your groupmate and let him/her answer them.

1. What is a resistor used for?

2. When does the temperature of a resistor rise?

3. What element is used to change the value of voltage?

4. How are resistors rated?

5. What types of resistors do you know?

6. When does a resistor get open?

7. What does an open resistor result in?

8. What is the difference between a fixed resistor and a variable resistor?

9. How much is the current-carrying capacity of a two-ohm resistor?

10. What resistors have a variable value?

8. Solve the problem:

What is the maximum current for a resistor having a 5-watt capacity and a resistance of 20,000 ohms?

9. Pair work. Think of three similar problems of your own. Ask your groupmate to solve them. Unit Nine [9]

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.

cell

[sel]

элемент

output

[ˈautput]

емкость, мощность

bulb

[bʌlb]

электрическая лампа

to light

[laɪt]

зажигать, освещать

to increase

[ɪnˈkriːs]

увеличивать(ся), возрастать

to substitute

заменять

... and so on

и так далее

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

[ɪˈlektroud]

electrode

___________________________

[ɪˈlektrəlaɪt]

electrolyte

___________________________

[stɑːt]

start

___________________________

[ˈɔpəreɪt]

to operate

___________________________

[ˈaɪsəleɪt]

to isolate

___________________________

3. Translate into Russian and put down the Russian equivalents. Then translate the Russian equivalents back into English (orally).

a. current capacity

______________________________

resistor temperature

______________________________

voltage output

______________________________

current value

______________________________

b. to start supplying energy

______________________________

to stop operating

______________________________

to start lightening

______________________________

to stop lightening the bulbs

______________________________

c. to operate well

______________________________

to operate badly

______________________________

to increase the voltage output

______________________________

to substitute the resistor

______________________________

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