Основы английского языка для судовых электриков | страница 22

б/ Подробно опишите на английском языке Рисунок 1 /а, Ь, с/.

19. /5 мин./ Прочтите/прослушайте и постарайтесь понять следующие предложения. Перефразируйте выделенные слова, используя лексику основного текста.

1. Last century there was much progress in observation on electricity. 2. The atom has been considered as undivided matter before. 3. Now 1 want to examine you a "little. - I don’t object. 4.11 was found out that any two unlike substances could be electrified.

20. /5 мин./ Ответьте на вопросы: -J F

l.When was the ideas of the nature of matter & electricity revolutionized? 2.How was the atom regarded hitherto? 3.How is -the atom regarded today? 4.What is matter now considered to be made of?

21. /2 мин./ а/ Прочтите/прослушайте и запомните информацию о естественных магнитах, б/ Слушая сокращенный вариант этой информации, скажите, что было опущено. /Опущенная информация выделена в тексте курсивом/.

Fig. I.

	Nucleus
с/

Valenceelectron

aJ Bodies charged with the same kind of electricity experience a mutual repulsion force.

b/ Bodies charged with opposite kinds of electricity experience a mutual force of attraction.

с/ Bohr model of a copper atom. It has 3 filled “shells" with 2, 8, and 18 electrons rotating in them.

Natural Magnets.

Centuries ago it was discovered that certain stones taken from the earth had two peculiar properties. One was that they possessed the power to attract & hold to them other bits of similar stones or iron. The other was that, when a piece of this stone was suspended /hung/ from a cord /горе/, it would always come to rest with one end pointing north. The Chinese were the first to discover & use this stone to aid / help/ in determining directions. Its later common use was in navigation.

22. Отработайте правильность чтения основного текста, следя по книге и повторяя за диктором в паузах /15 мин./.

23. /6 мин./ а/ Прослушайте/прочтите короткий рассказ об одном ученом, постарайтесь понять как можно больше информа-ци и догадаться, о ком идет речь, б/ Выскажите свое мнение или обменяйтесь мнениями о значении изобретения этого ученого со своим партнером.

He was an architect, bridge builder, researcher in physics & an electrician. His famous invention was regarded as perpetual motion*. It was displayed in May, 1834. The apparatus consisted of two sets of electromagnets, eight in each set. One set was stationary & the other one* was fastened to a rotational wheel. He could not continue his experiments in Germany. He was able to resume** the work only in Russia where he was granted 50,000 roubles. Soon he made the motor with 24 stationary U-shape electromagnets & 12 rotating electromagnets.' The output of this motor was 120 W. During the experiment on the Neva the output was 180 W. His final result was 550 W or 3/4 of a horsepower. The failure*** of his invention resulted from great weight of many batteries. Yet this motor as a new form of marine power was further developed into the modern electric motor.