Добавил:
Upload Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:
Energy and Electronics (Atroshkina A.A.,etc.).doc
Скачиваний:
20
Добавлен:
18.07.2019
Размер:
5.27 Mб
Скачать

XV. Make the plan of the given text.

XVI. Discuss the main points of your plan with a partner.

XVII. Skim over text 1c (See appendix, lang. Learn. Focus, p. 117). Give a better title for this text and prove your point of view. Text 1 c. Batteries

A battery is a simple device that converts chemical energy directly to electrical energy. It consists of two or more galvanic, or electrochemical, cells that produce direct-current electricity. The term battery is also commonly applied to a single galvanic cell. Every battery (or cell) has a cathode, or positive electrode, and an anode, or negative electrode. These electrodes must be separated by and are often immersed in an electrolyte that permits the passage of ions between the electrodes. The electrodes materials and electrolyte are chosen and arranged so that sufficient electromotive force (voltage) and electric current (amperes) can be developed between the terminals of a battery to operate lights, machines, or other devices. Since an electrode contains only a limited numbers of units of chemical energy convertible to electrical energy, it follows that a battery of a given size has a certain capacity to operate devices and will eventually become exhausted. The active parts of a battery are usually encased in a box (or jacket) and cover system that keeps air outside and the electrolyte solvent inside and that provides a structure for the assembly.

The first battery appears to have been constructed about 1800 by Alessandro Volta, a professor of natural philosophy at the University of Pavia in Italy. This device, later known as the voltaic pile, was composed of a series of silver and zinc disks in pairs, each of which was separated with a sheet of pasteboard saturated in salt water. A current was produced when the uppermost disk of silver was connected by a wire to the bottom disk of zinc. In 1836 the English chemist John Daniell developed what is considered the classic form of the voltaic cell.

Batteries are divided into two general groups: (1) primary batteries and (2) secondary, or storage, batteries. Primary batteries are designed to be used until the voltage is too low to operate a given device (flashlights, certain transistorized portable radios, electric razors, etc.) and then discarded. Secondary batteries consist of an assemblage of several identical voltaic cells. The lead-acid type of a secondary battery serves as the power source for the electrical systems of many kinds of motor vehicles, particularly automobiles and trucks.

Lesson 2. Atomic energy

TEXT 2 A. Atomic Energy;

Grammar Exercises (Modal Verbs and Their Equivalents);

TEXT 2 B. The Law of Energy Conservation;

TEXT 2 C. History of Radiography: X-Rays, Gamma Rays.

Pre-Text Exercises

Active Vocabulary

I . Practise reading the words written below. You’ll come across them in text 2 a.

  1. single …………………….

  2. drop ……………………...

  3. to split …………………...

  4. quantity ………………….

  5. reliable …………………..

  6. liquid …………………….

  7. to circulate ………………

  8. to carry away ……………

  9. pipes ……………………..

  10. coal-burning furnace …….

  11. to mention ……………….

  12. to put into operation ……..

  13. to supply ………………...

  14. achievement ……………..

  15. installation ………………

  16. to consider ……………….

  17. rod ……………………….

  18. enriched …………………

  19. moderator ………………..

  20. graphite ………………….

  21. to slow down …………….

  22. to release ………………...

  23. fission ……………………

  1. to give off ………………..

  2. core ……………………...

  3. coolant …………………..

  4. boron …………………….

  5. to absorb ………………...

  6. to shut off ………………..

  7. to shield ………………….

  8. concrete ………………….

  9. to cause ………………….

  10. by-product ……………….

  11. dioxide …………………..

  12. stainless ………………….

  1. can ……………………….

  2. blanket …………………..

  3. to capture ………………..

  4. spare ……………………..

  5. sodium …………………..

отдельный

капля

расщеплять

количество

надежный

жидкость

циркулировать

переносить

радиатор

печь, работающая на угле

упоминать

ввести в действие, в эксплуатацию

снабжать, доставлять

достижение

установка

рассматривать

стержень

обогащенный

регулятор, замедлитель (ядерн.реакций)

графит

замедлять

выпускать, освобождать

расщепление, деление атомного ядра при цепной реакции

выделять, испускать

центр

смазочно-охлаждающая эмульсия

бор

поглощать

прекращать, заканчивать

покрывать, защищать

бетон

вызывать

побочный продукт

двуокись

устойчивый против коррозии, нержаве- ющий

жестяной контейнер

поверхностный слой, оболочка

захватывать

свободный

натрий

Соседние файлы в предмете [НЕСОРТИРОВАННОЕ]