III. Перепишите и переведите письменно предложения и словосочетания, обратите внимание

на многозначность предлогов.

1. The engagement was broken off. 2. They but broke up remained friends. 3. Welcome in Tyumen. 4. Come in. please. 5. He finished his work in time^6. The train arrived right on time.

IV. Перепишите предложения, подчеркните инфинитив и инфинитивные обороты, переведите
предложения на русский язык.

1. Не is sure to finish school with a gold medal. 2. I saw him leave the house. 3. The task is easy for you to cope. 4. A commission was set up to develop cooperation between the two countries. 5. At that time it was difficult for her to study well. 6. The mother wanted her children to go shopping.

V. Определите, от каких частей речи образованы выделенные слова; переведите предложения
на русский язык.

1. Pass me the salt, please. 2. He passed by without saying a word. 3. Solve this problem, please. 4. Dissolve some salt in water. 5. This was a dangerous experiment. 6. Henry Cavendish did scientific experiments as a hobby.

VI. Перепишите предложения, переведите их на русский язык; напишите прописью
числительные.

1. There are 7 days in a week. 2. There are 4 seasons in a year. 3. 3 and 6 are eight. 4. Water boils at 100 degrees. 5. The Russian scientist Mikhail Vasilievich Lomonosov was born in 1711. 6. At the age of 17 he left his native village, and made his way to Moscow.

| VII. Прочитайте текст, переведите его письменно и составьте план.

The Concept of Electrical Current

In the beginning of the 17¹ century Sir William Gilbert discovered that many substances could be electrified by friction. Gilbert named this effect "electric" after the word "electron" - the Greek name for amber. In 1756 the Great Russian scientist M.V. Lomonosov was the first to make theoretical analysis of electrical phenomena.

At present the nature of electrification is explained by the electron theory.

According to the modern theory all matter is composed of atoms or tiny particles. There are many kinds of atoms. Each atom consists of a nucleus, a small positively charged mass and a number of lighter negatively charged particles called electrons, which revolve around the nucleus. Normally each atom of a substance is electrically neutral, or it has equal amounts of negative and positive charges, i.e. produces no electrical effects. If the number of negative charges is not equal to the number of positive charges, the matter will produce electrical effects.

When an electric charge is at rest it is spoken of as static electricity, but when it is in motion it is referred to as an electric current. An electric current is described as a flow of electric charges along the conductor.

Metals are good conductors of electricity, whereas nonmetals are poor conductors. The poorest of conductors are called insulators or nonconductors. There are a large number of substances that are neither good conductors of electricity nor good insulators. These substances are called semi-conductors. An electric current, which flows in the same direction through a conductor or current, which doesn't change its polarity, is called a direct current or a continuous current. Its abbreviation is D.C. An alternating current (A. C.) flows first in one direction and then in the other.

An electric circuit is a path through which an electric current flows. This is a complete path along which electrons can transmit their charges. An electric circuit includes a battery, generator, or magnetic means I for producing current flow. Some portion of the current is made to do useful work.

llhe circuit is opened when no charges can move due to a break in the path. The circuit is closed when I no breaks exist - when switches are closed and all connections are properly made. Special symbols are used to show electrical systems.

Wordlist

particle частица

nucleus ядро

charge заряд

electric current электрический ток

conductor проводник

insulator диэлектрик

direct (alternating) current постоянный (переменный) ток

electric circuit электрическая цепь

amber янтарь

Контрольная работа № 2 Вариант № 3