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

1. The cost of aluminium is comparatively low while … .

2. In a short length of wire power loss is extremely low while … .

3. The greater the load the lower is the efficiency of the line … .

7. Answer these questions:

1. Why is aluminium widely used nowadays?

2. Is its cost very low or comparatively low?

3. What is the cross-section of copper conductors?

4. May one ignore power loss in short wire? Why?

5. What does the efficiency of a line depend on?

6. What are fuses used for?

7. When does a line become inefficient?

8. Think of three questions about this extract and put them to your groupmate.

conˈsumer  потребитель; relation  отношение

When electric energy is produced at the power station, it is to be transmitted over electric wires to the consumer. Wire conductors offer resistance to the current flow; the longer the wire, the greater is its resistance to the current flow. Accordingly, the higher the offered resistance, the greater are the heating losses in the wire.

Unit Twenty-Six [26]

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.

area

[ˈɛərɪə]

площадь, область

distance

расстояние

network

сеть электролиний

support

опора, мачта

cord

провод

bus

шина

enterprise

[ˈentəpraɪz]

предприятие

to term

называть, именовать

to divide

[dɪˈvaɪd]

делить, разделять

to support

поддерживать

to distribute

распределять

accordingly

соответственно

as to

… что касается; … что до

long distance

большое расстояние

length of transmission lines

длина линий передачи

power consumption

потребление энергии

distribution centre

распределительный центр

city area

район городской застройки

2. Put down the Russian for:

interdependent city areas

_________________________________

interacting underground lines

_________________________________

interconnected overhead lines

_________________________________

transmitting power lines

_________________________________

transmission and distribution lines

_________________________________

overhead lines

_________________________________

step-down transformer

_________________________________

indoor lines

_________________________________

underground lines

_________________________________

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