What does a force of attraction mean?

What kinds of   electricity are there?

 III. Supply some, any, no, where required

1.... pupils went to the river,... to the woods. 2.... of my friends live in Moscow. 3....Have you... English dictionaries? 4. Is  there... ink in the inkstand? Yes, there is... 5. Bring...chalk, please. 6. There is... chalk in the box. 7. Is there... milk in the jug? Yes, there is

V. Fill in blanks with the Past Progressive or the Past Simple Tense of the verbs in margin.

1. We... to a lecture yesterday at ten o'clock.                                              listen

2. She... the piano from 11 till 12 o'clock.                                                    play

3. When he... in, I... my exercises.                                                               come, do

4. What... you yesterday at 8 o'clock?                                                          do

5. Yesterday when I... the newspaper, my sister... to a concert over the radio.   read, listen

6. She... out of the window when I... her.                                                    look, see

7. I... along the street with my friend when the car... by.                           walk

Контрольная работа №2

I. Translate the text:

What is electricity?

  Have you ever gotten a shock when you touched a doorknob, or seen sparks fly when you combed your hair? That's electricity.

  Electricity is a type of energy that gives things the power to work. This energy comes from electrons. Scientists have learned how to use electrons to produce electricity. I.

Classes of electricity.

The study of electricity may be divided into three classes or branches: magnetism, electrostatics, and electrodynamics. Magnetism is the property of the molecules of iron and certain other substances through which they store energy in a field of force because of the arrangement 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 charges 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..

 II. Translate the text:

Оборудования работающего на основе использования возобновляемых источников энергии для автономного тепло- и электроснабжения частных домов и зданий. С его помощью можно частично или полностью покрыть энергозатраты практически любого объекта.

- солнечные вакуумные водонагреватели для круглогодичного производства горячей воды

 - ветрогенераторы для выработки электроэнергии.

 - солнечные фотоэлектрические батареи и товары на их основе – зарядные устройства, фонари.

 - энергоэффективные светодиодные лампы

 III. Fill in the blanks with the articles a, an, the, where necessary.

We live in... nice flat... new house near... park.... flat is on … second floor. There are... two rooms in it. We have also... kitchen and … bathroom.... kitchen is... big enough. As... rule, my mother cooks for us. We spend... lot of... time together in... kitchen. There is... TV set in

... corner of... kitchen, and we often watch... TV there.

 

Контрольная работа № 3

I. Translate the text.

Electroscope

An electroscope is a sensitive instrument for detecting small electric charges. It consists of a glass-jar closed with a stopper of insulting material in which is fitted a varnished glass-tube. A rod passes through the tube. At the top of the rod there is a metal ball or disc at the bottom of the rod two pieces of gold leaf are suspended. When is charge is brought near the electroscope, a charge of opposite sign is induced on the metal ball, and a charge of the same sign appears on the two of the gold leaves. Since, the two pieces of gold leaf now have charges of like sign they repel each other.

As an example a negatively charged glass rod is brought to the electroscope. A positive charge is induced on the ball and a negative charge appears on the two pieces of gold leaf.

The polarity of a charge may be determined by means of an electroscope. We charge the electroscope negatively by touching the ball with the rod of hard rubber which is rubbed with flannel or silk. If the unknown charge is brought to the electroscope it will induce on the ball a charge of opposite polarity and on the gold leaves a charge of the same polarity as that of the unknown charge. Therefore, if the unknown charge is negative, the gold leaves will repel each other; if it is positive, they will attract.

II. Translate the text.

ЭЛЕКТРОСКОП, прибор для обнаружения электрического заряда. Наиболее распространен электроскоп с золотыми листочками, в котором две золотые пластинки, прикрепленные к проводнику, помещены в изолированный корпус. Если к стержню проводника подвести электрический заряд, пластинки разойдутся, и степень расхождения указывает на величину заряда.

III. Fill in the pronouns.(местоимения)                                          

When Mary came to the dining room... took off... coat and sat down. The waitress soon brought... some soup. When Mary finished... dinner... looked at... watch, put on... coat and went out. (Now Mary tells her little brother John what he must do when he goes to the dining room):... must take off... coat and sit down. Then the waitress will bring... some soup. When

... finish... dinner... must put on... coat and go out.

 

Контрольная работа №4

I.    Translate the text.