Lesson-27 ,28Text: A great citizen of the world. Every day many people visited Thomas A. Edison’s laboratories in Orange, New Jersey. Some of them were young inventors who went to study, but many more of them were tourists. They came from all parts of US and from other countries as well. One day a very important citizen from England visited Edison’s factories, taking with him his young son, eight years old. They spend many hours in great workshops, looking at hundreds of useful inventions. Before leaving the laboratories the man went to the office of the main building. Giving his card to the person in charge, he asked: “May I speak to Mr. Edison, please?” The man looked at the card and then answered: “Wait a minute, I’ll see”. Soon he returned and said: “Come this way, please. Mr. Edison will see you. The father and his son went into the great inventor’s workroom. “Mr. Edison”, said the Englishman, “I brother my young son here to see what the world’s greatest citizen has done. I want this day to help him all his life. Will you please shake hands with him and say something that he will remember?” Mr. Edison took the boy’s hand. He laid his other hand on the child’s shoulder and looked into his eyes. “My boy”, he said, “don’t watch the clock”. In 1928 Mr. Edison was eighty- one years old, but he still worked sixteen hours a day. Text: Solar light by night. Most people living in towns consider it a usual thing that streets are lit at night. But streets lights need power supply therefore distant areas with no sours of electricity remain in darkness until the sun comes up again. With new appliances now offer by several British firms, many distant places could be lit with solar-powered street lights. It may seem strange that the lamps can use the power of the sun which shines by day when the lamps are needed at night, but they work by using energy accumulated during the day from a solar panel. The solar panel produces electricity which charges a battery. When the sun does goes down, the battery power is then used for lighting. Each lamp has its own panel so the system can be used for one individual light or a number of them. In the of Saudi Arabia a motorway tunnel miles from any power supply is lit day and night by solar-powered devices. The solar panels provide power during the day and charge butteries which accumulate enough power to light the tunnel at night. The generation of electricity by butteries is still expensive but the advantage of sun-powered lamps is that they can bring light to areas distant from any other power supply. There is one more advantage of solar power: not only limited, but also its use does not pollute the environment. That is why it is very important to developed devices which make it possible to transform solar power into mechanical or electric forms of power. Text: Non-traditional Renewable Sources of Energy It is known that much is being done in the world today for the development of non-traditional sources of energy. Without them the Earth cannot support its present population of 5 billon people and probably 8 billon people in the 21st century. Now we are using traditional power sources, that is, oil, natural gas, coal and water power with the consumption of more than 50 billon barrels per year. It is evident that these sources are not unlimited. That is why it is so important to use such renewable sources of energy as the sun, wind, geothermal energy and others. Research is being carried out in these fields. One of the most promising research is the development of power stations with direct transformation of solar energy into electricity on the basis of photo-effect. It was Russia that was the first in the world to develop and test a photoelectric battery of 32,000 volts and effective area of only 0.5 sq.m., which made it possible to concentrate solar radiation. This idea is now being intensively developed in many countries. However, the efficiency of solar power stations is considerably reduced because of the limited time of its work during the year. But it is possible to improve the efficiency of solar power stations by developing different combinations of solar power stations by developing different combinations of solar power stations and traditional ones-thermal, atomic and hydraulic. Today some engineers are working at the problem of developing electric power station s with the use of a thermal-chemical cycle. It will operate on products of the transformation of solar energy, whereas the “solar” chemical reactor uses CO2 and water steam of the thermal power station. The result is that we have a closed cycle. In Kamchatka there are geothermal power stations operating on hot water- steam mixture from the depths of about a kilometer. In some projects water will be heated by the warms of mountains at a depth of four- five km.
It is paneled that plants working on the energy of the solar heat provided by the sun will be built on a large scale. That different wind energy plants are being developed is also well-known. These energy plants can be small (of several kilowatts) and large powerful systems. It is important that all these advances in developing new sources of energy and improving the old ones help to solve the energy problem as a whole and they do not have negative effects on the environment. 2. Put the missing words: Take words from the box: We hear so much these days of local problems of electricity 1….. Many. 2….. are taking steps to 3….. their electricity 4….. This a result of the recent 5….. in electricity tariffs for 6….. We should all try to 7….. less 8…, by insulating our houses, turning off the 9….. when leaving a room and using less hot water. We must try to develop alternative 10….. of energy to 11….. electricity for domestic and industrial 12….. It is known that nuclear power comes to the consumer as electricity, which is clean and convenient from of 13….. Although nuclear 14….. stations are large, they can be built 15….. from places where people live.
3. Make Word combinations: A B 1. carry out (conduct) a) a problem 2. solve (face, work at, deal with) b) changes 3. become c) a success 4. suffer from d) an effect on 5. bring about e) measures 6. have f) study, research, experimental work 7. make g) the centre of, a part of 8. develop h) investments 9. take i) a program, concept, theory 10.achieve j) noise, pollution
4. Speak about: The main types of fuel or processes used to generate energy in our country.
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