- •Vacuum cleaner пылесос
- •Assignment 5. Read and translate the text:
- •Assignment 7. Translate the following sentences using the Participle.
- •Assignment 5. Read and translate the text:
- •Text 2. Energy
- •Text 2а. Harnessing solar energy
- •Text 3. Atomic energy
- •Assignment 8. Fill in the blanks with prepositions:
- •Assignment 9. Translate the following sentences paying attention to the words need and turn.
- •Assignment 10. Answer the following questions:
- •Тeхт 3а. Kurchatovium аnd some other new elements
- •Text 4. Lightning
- •Text 4a. Is lightning good or bad?
- •Assignment 5. Read and translate the text:
- •Text 5. Atmospheric electricity
- •Assignment 11. Fill in the blanks with prepositions.
- •Assignment 4. Read and translate the text:
- •Text 6. Magnetism
- •Notes to the text:
- •Assignment 5. Translate the following sentences paying attention to the verbs.
- •Text 7. Early history of electricity
- •Notes to the text:
- •Assignment 6. Translate the following sentences paying attention to the verbs.
- •Text 8. Lomonosov
- •Notes to the text:
- •Jack London
- •Assignment 4. Translate the following sentences paying attention to the Infinitive:
- •Assignment 5. Read and translate the text:
- •Text 9. From the history of electricity
- •Notes to the text:
- •Assignment 4. Read and translate the text:
- •Text 10. Electric current
- •Notes to the text:
- •Assignment 7. According to the models given below form sentences combining suitable parts of the sentence given in Columns I, II, III, IV.
- •Assignment 4. Read and translate the text:
- •Text 11. What is heat?
- •Notes to the text:
- •In dividing the atom the man releases forces of great magnitude. These are forces that bind the central core of the atom. This central core – the nucleus – is extremely small in diameter.
- •Text 2. Peaceful uses of atomic energy
- •It is interesting to note that a 210,000 kW heat power plant consumes more than 2,000 tons of coal daily, whereas an atomic - power plant of equal capacity takes only about 800 grammes of Uranium-235.
- •Text 3. Nuclear power station
- •Text 4. Power from the atoms
- •Contents
Text 7. Early history of electricity
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 colour.
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.