fternoon everybody. Im glad to see you. I hope you are fine today and ready to work hard. So, lets start. Today we are going to read the text about fuses and to learn about the Infinitive.
2) Работа с текстом Fuses.
Look at the text, please.
Fuses.
Fuses are widely used nowadays as protection devices. They are utilized in various circuits, electrical equipment and installations. Fuses serve to protect them against overcurrents and short-circuits.
There are different types of fuses in use nowadays. Of them, quartzsand fuses serve for voltages up to 500 volts; fuses of this kind are produced with current ratings of 15 to 60 amp and of 100 to 350 amp.
Fuses are commonly used in low-voltage industrial installations rated up to 1,000 V.
Fuse protection is based on a very simple principle: in case of a short-circuit or overcurrent, when the maximum value of current has been exceeded, the fusible link of a fuse is heated to its melting point. This opens the circuit and disconnects the circuit from the power source. In case of a fault, one should replace the faulty fusible element by a new one.
Fuses are used both in direct current (d. c. ) and alternating current (a. c. ) circuits.
Kolya, read the first paragraph with Russian translation. Sasha, read the second one and translate it. Dima, will you read and translate the last paragraph of the text.
And now you are to complete the sentences using the correct variant:
1) A fuse serves a) as a load.
b) as a protection.
2) Fuses are useda) for d. c. only.
b) for both a. c. and d. c.
3) In case of a faulta) the whole fuse should be replaced.
b) the faulty link should be replaced.
4) Fuse protection is based ona) a simple principle. <
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