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

1. The primary circuit of a relay is its electromagnetic circuit … .

2. When there is no current in the relay’s primary circuit the contacts open … .

3. Without a relay conductors with a large cross-section should be used … .

4. Every evening street lights are switched on … .

7. Answer the following questions:

1. What are the main parts of a relay?

2. How is a relay put into operation?

3. When does the spring pull the armature?

4. What wires connect the panel with the relay?

5. By what means are street lights switched on and off?

8. Pair work. A) Match the questions and the answers, b) Ask the questions and let your groupmate answer them.

1. In what position does die switch have high (low) resistance?

2. What are die functions of the switch?

3. In what position is the switch open? Closed?

4. In what way is the switch connected to the circuit?

a) Switches are used to open and close the circuits.

b) Closed is the on-position; open is the off-position.

c) The switch is connected in series with the load.

d) In the on-position the closed switch has a very low resistance, which results in maximum current in the load with zero voltage loss across the switch. When the switch is off it has a very high resistance and no current flows through the circuit.

Unit Twenty-Three [23]

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.

fuse

[fjuːz]

плавкий предохранитель

link

[lɪŋk]

звено, связь

fault

[fɔːlt]

дефект, неисправность

faulty

неисправный

equipment

[ɪˈkwɪpmənt]

оборудование

installation

[ˌɪnstəˈleɪʃn]

установка; pl. сооружения

to protect

[prəˈtekt]

защищать, предохранять

to utilize

[ˈjuːtɪlaɪz]

использовать

to equip

[ɪˈkwɪp]

оборудовать, снаряжать

to serve

служить

to melt

плавить

up to

вплоть до

2. Read the words and put down their Russian equivalents. Then translate them back into English (orally).

quartz

[kwɔːts]

_________

quartz-sand fuse

______________

base

[beɪs]

_________

fusible link

______________

principle

_________________

faulty protection device

______________

stress

_________________

faulty fusible link

______________

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