- •1. Learn the following active words and use them in the sentences of your own
- •3. Look through the text and write out the English equivalents of the following words and word combinations. Use them in the sentences of your own.
- •5. Give short answers to the following questions:
- •7. Translate the following sentences:
- •1. Learn the following active words and use them in the sentences of your own.
- •2. Translate the following chains of words. Define what parts of speech they are
- •3. Look through the text and find the English equivalents to the following words and word combinations; use tem in the sentences of your own.
- •4. Translate the following sentences paying attention to the participle:
- •1. Learn the following active words and expressions. Use them in the sentences of your own.
- •4. Answer the following questions:
- •5. Work in pairs. Put questions to your partner and he (she) will answer them.
- •8. Translate the following sentences paying attention to the words need and turn:
- •9. Put all possible questions to the following sentences:
- •10. Define the following words according to the model given below.
- •13. Describe Fig. 2.
- •Exercises
- •Learn the following active words and use them in the sentences of your own:
- •2. Translate the following sentences, paying attention to the gerund:
- •7. Translate the following sentences paying attention to the words in bold type:
- •8. Put 5 questions to the text beginning with what.
- •9. Speak on the story told by the early Scandinavians.
- •10. Make an outline of the text.
- •1. Learn the following active words and use them in the sentences of your own.
- •2. Look through the text and find the English equivalents of the following words and word combinations:
- •5. Find the gerund in the text, define its function.
- •8. Translate the following sentences paying attention to both, both...And:
- •9. Fill in the blanks with prepositions:
- •10. Translate into Russian:
- •11. Form five sentences combining suitable parts of the sentence given in Columns I and II:
- •12. Describe Franklin's kite experiment.
- •13. Give a short summary of the text.
- •Exercises
- •1. Learn the following active words and Expressions
- •Look through the text and find the English equivalents of the following words and word combinations:
- •8. Make up a story of Franklin's kite experiment using the following sentences and sentences of your own (our sentences are given in a disorderly way):
- •11. Use the following expressions in sentences of your own:
- •13. Speak on magnetism.
- •15. Describe Figs 3 and 4.
- •Exercises
- •8. (A) For the names of the countries given in Column I find the names of the nations given in Column II:
- •10. Speak on:
- •11. Make an outline of the text.
- •12. Retell the text.
- •Exercises
- •1. Learn the following active words and use them in the sentences of your own:
- •2. Define the functions of the participle and the gerund in the text.
- •4. Answer the following questions:
- •5. Fill in the blanks with suitable words and word combinations given below:
- •6. (A) For the verbs in Column I find suitable nouns in Column II.
- •7. (A) Translate the following word combinations:
- •10. The following statements are not true to the fact. Correct them:
- •11. Make an outline of the text.
- •12. Retell the text.
- •1. Learn the following active words and use them in the sentences of your own:
- •2. Translate the following word chains into Russian, define what part of speech the words are.
- •4 Translate into Russian:
- •8. Form 10 sentences using the following words:
- •10. Translate the following sentences paying special attention to the words in bold type:
- •11. Retell the text.
- •12. (A) Fill in the blanks with prepositions, if necessary; (b) retell the text:
- •1. Learn Active Words and Expressions
- •2. Look through the text and find the English equivalents to the following words and word combinations. Use them in your own situations.
- •The Infinitive
- •2. Translate the following sentences paying attention to the infinitive
- •3. Translate the following sentences paying special attention to the words in bold type:
- •4. Translate the following sentences paying special attention to the infinitive:
- •5. Fill in the blanks with the words one or for:
- •6. Write out from the text all the sentences where the infinitive is used, and define its function. .
- •1. Active Words and Expressions
- •3. According to the models given below form sentences combining suitable parts of the sentence given in Columns I, II, III, IV,
- •5. Work in pairs, ask your fellow-students questions:
- •6. Explain why:
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •Exercises
- •1 Learn the following active words and expressions and use them in the sentences of your own.
- •3. (A) Find the non-finite forms of the verb in the text; (b) define their functions.
- •4. Translate the following words and define what parts of speech they are:
- •5. Write out the adjectives with the suffix -able from the text. Translate them.
- •7. Answer the following questions:
- •9. Translate the following word combinations and use them in sentences of your own:
- •Exercises
- •2. (A) Give headings to each paragraph of the text; (b) explain why you have given such headings.
- •3. Translate the following sentences:
- •4. Define the non-finite forms of the verb met in the text.
- •5. Put 10 questions to the text.
- •6. Translate the following sentences:
- •7. Speak on:
- •Exercises
8. Make up a story of Franklin's kite experiment using the following sentences and sentences of your own (our sentences are given in a disorderly way):
1. The key was connected to the lower end of the string, 2. The story about Franklin's famous kite is known all over the world. 3. They took some necessary things such as: a kite with a long string, a key and so on. 4. It was proved that lightning is a discharge of electricity. 5. It was a stormy day. 6. The electricity was conducted from the clouds down the string to the key. 7. The kite was flying high among the clouds. 8. The rain wetted the string. 9. Atmospheric electricity greatly interested Franklin. 10. The rain fell.
9. Define what parts of speech these words are:
application, ability, continuous, use, important, numerous, civilization, electric, familiar, reader, widely, useful, powerful, property, certainly
10. Form two sentences with each of the following words: similar, simple, single
11. Use the following expressions in sentences of your own:
all over the world; as well as; in this connection; in the form of; needless to say; to pay attention to
12. Put two questions to each paragraph of the text and answer them.
13. Speak on magnetism.
14. Compare:
A generator and a motor.
Potential energy and kinetic energy.
Chemical energy and mechanical energy.
Nuclear power station and steam power station.
15. Describe Figs 3 and 4.
LESSON SEVEN
EARLY HISTORY
Let us now turn our attention to the early facts, that is to say, let us see how it all started.
History shows us that at least 2,500 years ago, or so, the Greeks were already familiar with the strange force (as it seemed to them) which is known today as electricity. Generally speaking, three phenomena made up all of man's knowledge of electrical effects. The first phenomenon under consideration was the familiar lightning flash—a dangerous power, as it seemed to him, which could both kill people and burn or destroy their houses. The second manifestation of electricity he was more or less familiar with was the following: he sometimes found in the earth a strange yellow stone which looked like glass. On being rubbed, that strange yellow stone, that is to say, amber, obtained the ability of attracting light objects of a small size. The third phenomenon was connected with the so-called electric fish which possessed the property of giving more or less strong electric shocks. It was known that in some parts of the world such shocks could be obtained by a person coming into contact with the electric fish.
These three effects could be observed by the man of 25 centuries ago and the same three effects, and no more, made up all the knowledge of electrical phenomena for the man living about four centuries ago. Nobody knew, of course, that the facts observed were due to electricity. People could neither understand their observations nor find any practical applications for them.
As a matter of fact, all of man's knowledge in the field of electricity has been obtained during the last 370 years, or so. Needless to say, it took a long time before scientists learned how to make use of electricity. In effect, most of the electrically operated devices, such as the electric lamp, the refrigerator, the tram, the lift, the radio, and so on, are less than one hundred years old. In spite of their having been employed for such a short period of time, they play a most important part in man's everyday life all over the world. In fact, we cannot do without them at present.
So far, we have not named the scientists who contributed to the scientific research on electricity as centuries passed. However, famous names are connected with its history and among them we find that of Phales, the Greek philosopher. As early as about 600 b.c. (that is, before our era) he discovered that when amber was rubbed it attracted and held minute light objects. However, he could not know that amber was charged with electricity owing to the process of rubbing.
For more than 20 centuries people were familiar with the above-mentioned phenomenon before anything was done to find out more about it Then Gilbert, the English physicist, began the first systematic scientific research on electrical phenomena. He discovered that various other substances possessed the property similar to that of amber or, in other words, they generated electricity when they were rubbed.
He gave the name "electricity" to the phenomenon he was studying. He got this word from the Greek "electrum" meaning amber, "electrum," in its turn, meaning "sun." The name was certainly given amber because of its yellow color.
Many learned men of Europe began to use the new word "electricity'" in their conversation and were soon engaged in research of their own. Scientists of Russia, France and Italy made their contributions as well as the Englishmen and the Germans.