Conditional Sentences

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I	If atomic power replaces the present sources of power, we shall get more power than we produce
II	If atomic power replaced the present sources of power, we should get more power.
III	If Professor Rihman had thought of the possible danger, lightning would not have killed him

2. Translate the following sentences:

A. 1. If an emf is applied to a path which allows the electrons to pass, they will move toward the point of higher potential, and then a current is said to flow in the circuit.
2. If people of the past had known that lightning was atmospheric electricity, they would not have invented numerous stories. 3. If a wire is held against an electrified body, electricity would flow along the wire to the other end. 4. If coal were not used as fuel, we should get more valuable products.

B. 1. Were that liquid heated, it would greatly expand. 2.Were there no flow of current between A. and B. in any direction, then A. and B. would be at the same potential. 3. Were the electromotive force alternating, the current would be alternating as well. 4. Should we break the circuit, no current would flow. 5. Should they use a large water pipe, more water would pass through it.

3. Translate the following sentences paying special attention to the word provided:

1. These electrical devices are provided with rubber insulators. 2. These electrical devices provided with rubber insulators were produced at a large factory. 3. These electrical devices can work for a long time, provided they are made of good material. 4. The electric current flows provided there is a complete circuit. 5. Lightning did not strike the house as it was provided with a lightning conductor. 6. Ohm's law provided the possibility of determining resistance provided the voltage and current are known. 7. The electrons will jump through the air forming an electric spark, provided the potential difference becomes great enough. 8. The students will be able to translate difficult articles, provided they have dictionaries.

4. Fill in the blanks with prepositions and translate the following text:

The great French physicist, Ampere, was an absent-minded man. One day he was waiting ... his friend. The appointed hour arrived, passed and his friend did not come. As Ampere had to go ... he took a piece ... chalk and wrote ... his door: "I have gone ... . I shall return ... two hours." And he went away.

He returned two hours later. While he was going upstairs he worked out a very difficult problem.

"If my friend had come ... the appointed hour," he said ... himself, "I should have told him ... this problem. I shall speak ... him ... it now. Perhaps he will be able to solve it." So when he came ... his own door and saw the words written ... it, Ampere decided that he was ... his friend's door. "Oh," said he, "he has gone...! I am very sorry! Were he ... home, we should discuss my problem." And he wrote the following words: "Very sorry that I have not found you ... home." Then he went downstairs again.

Had Ampere not been an absent-minded man he would have never made such a mistake.

5. Complete the following sentences:

a)

1. If my friend comes to Moscow, we...

2. If I had time tomorrow, I...

3. If my friend had not entered the Institute last year, he...

4. If I were you, I...

5. If the teacher had given me the dictionary, I...

6. If my brother goes to England, he...

b)

1. Не would have done it, unless...

2. We should have gone to the country yesterday, provided...

3. I should finish my work in time tomorrow unless...

4. She will answer all the teacher's questions, provided...

6. Fill in the blanks with among or between:

1. The Voltaic pile consisted of copper and zinc placed one above another, with flannel moistened in salt water ... them. 2. A wire was connected ... the first disc of copper and the last disc of zinc. 3. There is a great difference ... conductors and insulators of electricity. 4. There are many good conductors; copper and silver are ... the best ones. 5. I found your dictionary ... my books. 6. The scientist determined the difference ... the two methods.

7. Translate the following words and expressions into English:

обращать внимание; на основе чего-л.; электротехника; по этой причине; удовлетворять требованиям; совсем не трудно; тем не менее; наоборот; оказывать сопротивление; в таких условиях; происходить

8. Put all possible questions to the following sentences:

1. The excess electrons will flow towards the point of deficiency.

2. The parallel circuit provides two or more paths for current flow.

9. Apply suitable adjectives to the following nouns.
Model: natural phenomena

difference, spark, force, wire, factor, resistance, conductor, ball

10. Form new words of the same root, define what parts of speech they are:

active, to differ, real, ease, conductance, resist

11. Speak on:

1. Potential difference.

2. Electromotive force.

3. Resistance.

LESSON FIFTEEN

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