Тема урока: Особенности работы системы электроснабжения в отраслевой сфере.
Тип урока: Комбинированный урок.
Вид занятия: практическое занятие.
Цели урока:
а) образовательная: изучить тему об особенностях работы системы электроснабжения в отраслевой сфере.
б) развивающая: развивать диалогическую и монологическую речь студентов, закрепить знание профессиональной лексики, активизировать навыки работы с различными информационными источниками, выполнять лексико - грамматические упражнения.
в) воспитательная: поддерживать интерес к теоретическому и практическому изучению профессиональных тем.
Оборудование: учебник «Английский язык для технических специальностей», Голубев А.П., учебное пособие «Английский язык», Луговая А.Л., раздаточный материал, таблицы.
Ход урока.
I . Организационный момент. Речевая зарядка.
II . Контроль за усвоением изученного материала.
1. Проверка знания новой лексики по теме «Электроснабжение в отраслевой сфере».
1) capacity - cnocoбнocть, npоизводительность, мощность
2) operating parameters – эксплуатационные параметры
3) rolling stock - подвижной состав
4) eight-axle locomotives – восьмиосные локомотивы
5) overhead (contact) wire – контактный провод
6) catenary - контактная сеть
7) third (conductor) rail – контактный (токопроводящий) рельс
8) electrical substation – электрическая подстанция
9) electrical cables – электрические кабели
10) running rails – xoдовые рельсы
11) density of traffic – напряженность nepeвозок
12) direct current (D.C.) – nocтоянный ток
13) alternating current (A.C.) – nepeменный ток
14) transmit – nepeдавать
15) voltage – напряжение
16) rectify – выпрямлять (ток)
17) distribute – pacnpeделять
18) frequency – частота
19) transform - npeo6paзовывать, npeвращать
20) feed – зд. снабжать (током)
21) emergency – aвария.
2. Контроль чтения и перевода текста “ Railway Electrification ”.
III . Изучение нового материала.
1. Прочтите следующий текст, чтобы проверить, сколько из отмеченных вами различий упомянуто.
NOTES: to levitate – подниматься; damper – амортизатор; concrete – бетон; to shift – здесь: перемещаться.
Magnetic levitation train
A MAGLEV (magnetic levitation) train does not run along a track in the normal way. Instead, magnetic fields lift it above the track, so that the train 'floats' along. Because they have no wheels, axles, suspension, dampers, or brakes, Maglev vehicles are light and compact. They are also pollution-free, as no fuel is burned within the train, and cheap to maintain.
The Maglev system at Birmingham Airport carries passengers from the terminal to the railway station and the National Exhibition Centre. The cars are made of lightweight fibreglass, carried on an aluminium chassis. All the electrical equipment which powers the cars is situated under the floors or the seats. Each car can take 32 passengers and their luggage, up to a weight of 8 tonnes. The trains travel at a maximum speed of 42km/h. A concrete guideway above the ground supports a T-shaped track for the two-car Maglev trains. The train is lifted from the track by magnetic attraction. This is the force by which two opposite magnetic poles attract each other (just as two of the same poles 20 repel each other). Powerful electromagnets at each corner of the train exert a pulling force which lifts the train upwards so that it floats 15 mm above the track. As people get on and off, the weight of the train varies. It may drop closer to the track than the required 15mm, or rise further from it. To keep it at an even distance from the track, the force is varied by a microprocessor. Each train is driven by an electric motor called a linear induction motor. Electromagnetic windings, or coils, on the train generate a magnetic field in which the magnetic poles shift along the train. The field induces electric current in the track, which in turn generates its own magnetic field. The two fields in the track and the train interact so that the shifting field pulls the floating train along the track.
2. Догадайтесь о значении следующих слов и выражений:
плавать, магнитное притяжение, магнитные полюса, ровное расстояние, линейный асинхронный двигатель, электромагнитные обмотки (катушки), взаимодействовать.
3. Составьте список преимуществ поезда на магнитной подушке, используя текст.
4. Составьте список недостатков поезда на магнитной подушке, используя текст.
5. Найти в тексте выражения с определением «магнитный» и прочитать все предложения.
6. Ответьте на этот вопрос, используя выдержку из текста ниже. Why are Maglev trains so light?
Because they have no wheels, axles, suspension, dampers, or brakes, Maglev vehicles are light and compact. When first introduced, linear motors were seen as a major technological breakthrough. However, disappointingly few practical applications have been found for this new development. An earlier innovation, the Wankel engine, was radically different from conventional engines, having a rotary piston and no valves. Wankel engines were adopted by the Mazda car company. However, Wankel engines are now rarely used because of problems with fuel consumption and maintenance. The Wankel story illustrates the risks involved in developing any new product - success can mean a market lead over competitors but failure means that expensive development costs must be written off with no result. Sadly, technological superiority does not guarantee success. Betamax video tapes, technically better than their rivals, gave way to VHS because of better marketing.
7. Каков будет результат этого действия?
Two magnets are held together with opposite poles facing. When an action is always followed by the same result, we can link them like this: If/When two magnets are held together with opposite poles facing, they attract each other. or If/When two magnets are held together with opposite poles facing, they will attract each other. When an action is always followed by the same result, the statement becomes a general principle or law. Using the law, we can predict what will happen in particular cases.
IV . Закрепление новых знаний.
1. Переведите следующие предложения на русский язык.
1. The driving cars of the experimental British train were to be fitted with 4 gas-turbine engines. 2. To put this train into service will be possible only after a series of special tests. 3. High-speed traffic requires the permanent way to 17 be excellently laid and carefully maintained. 4. To increase the speed of trains is a complicated problem. 5. The linear electric motor to be used on the Japanese railways will greatly increase the speed of trains. 6. The new instruments to be introduced on the substations will increase the reliability of the electric machines and the auxiliary apparatus. 7. It should be noted that speed control devices are used to provide definite speeds under certain conditions. 8. An electric locomotive contains electrical control equipment needed to control the electrical energy supplied to the motors. 9. Passenger and freight traffic is supposed to increase.
2. Раскройте скобки , вставьте глагол в нужной форме .
1. She was believed (to feel) unwell for some time. 2. He seems (to read) a lot. He seems (to read) now. He seems (to read) since morning. He seems (to read) all the books in the library.
3. I want (to take) you to the concert. I want (to take) to the concert by my father. 4. I am glad
(to do) all the work yesterday. 5. She seems (to work) at this problem ever since she came here. 6. I am sorry (to break) your pen. 7. He began writing books not because he wanted (to earn) a living: he wanted (to read) and not (to forget). 8. He seems (to know) French very well: he is said (to spend) his youth in Paris. 9. The woman pretended (to read) and not (to hear) the bell. 10. They seemed (to quarrel): I could hear angry voices from behind the door. 11. Perhaps it would upset her (to tell) the truth of the matter. 12. Her ring was believed (to lose) until she happened (to find) during the general cleaning. It turned out (to drop) between the sofa and the wall.
V . Этап подведения итогов.
VI . Информация о домашнем задании: Повторить изученную лексику; прочитать и перевести текст «Magnetic levitation train».
План урока №6