4 Answer the following questions

1. What is the difference between potential energy and kinetic energy? 2. What sources of energy do you know? 3. What form of energy can be changed into another form? 4. What are the industrial uses of electricity? 5. Can you name the device which changes chemical energy into electrical energy? 6. What is the difference between а battery and а generator? 7. What may coal be replaced by in future? 8. When was the first industrial nuclear power-station put into operation? 9. What contribution to nuclear engineering did Soviet scientists make? 10. What electrical devices do you use at home? 11. What forms of energy do you know? 12. What is the world's first nuclear icebreaker?

Устные темы

1. About myself

1. What is your name?

2. How old are you?

3. When and where were you born?

4. Where do you live now?

5. Where do you study?

6. Where do you work?

7. Is your family large or small?

8. Have you a brother/sister?

9. Are you married or single?

10. Have you any children?

11. How old are your children?

12. Where does your wife/husband work?

13. What are you fond of?

14. How do you usually spend your free time?

15. What do you dream of?

2. What is agriculture?

Agriculture is an important branch or economy. Economic growth of any country depends on 1 the development of agriculture which supplies the people with food and clothing and industry with raw materials.

The word "agre" is a Latin word. It means the cultivation of fields in order to grow crops. Now agriculture also includes the use of land to breed farm animals.

We do not know when people began to grow crops. It was many thou­sand years ago. Now crop production and animal husbandry are highly developed branches of agriculture.

Life is impossible without plants. They play a highly important role in everyday life of people. Plants that are grown by farmers are known as farm crops. They are used for many different purposes. Most of them are used directly as food for people, some are consumed by farm animals, oth­ers are used in industry and medicine.

In order to increase.crop yields and animal products our farms apply widely intensive technologies.

3. Electricity

The ancient Greeks knew that when a piece of amber is rubbed with wool or fur, it achieves the power of attracting light objects, later on the phenomenon was studied, and the word “electric” after the Greek word “electron” meaning “amber” was used.

The study of electricity may be divided into three classes: magnetism, electrostatics and electrodynamics.

Magnetism is the property of the molecules of iron and certain other substances through which they store energy in the field of force because of the arranged movement of the electrons in their atoms.

Electrostatics is the study of electricity at rest, or static electricity. Examples of this type of electricity are charge on condenser plates. Rubbing glass with silk produces static electricity.

Electrodynamics is the study of electricity in motion, or dynamic electricity. The electricity which flows through wires for light and power purposes is a good example of latter type of electricity.

No one has ever seen an electric current, we only know of the existence of a current by its effects. There are many kinds of current, for example, a direct current (d.c.), an alternating current (a.c.), a pulsating current.