Вариант № 1

Задание 1.

Перепишите следующие предложения. Определите по грамматическим признакам, какой частью речи являются слова, оформленные окончанием -s, и какую функцию это окончание выполняет, т.е. служит ли оно:

- Показателем 3-го лица единственного числа в Present Indefinite;

- Признаком множественного числа имени существительного;

- Показателем притяжательного падежа имени существительного.

Переведите предложения на русский язык

1) The new transformer requires general overhaul.

2) Since electrons are negative char­ges, they fly to the plate only when the plate is positive.

3. Most of the world's electric power is generated in steam plants driven by coal, oil,

nuclear energy, or gas.

Задание 2. Перепишите следующие предложения и переведите их, обращая внимание на особенности перевода на русский язык определений, выраженных именем существительным.

1) College-level physics books describe a less misleading method of measuring electric energy flow.

2) It will be a new energy conservation system.

3) There is a certain amount of the radio-frequency energy.

Задание 3.

Перепишите следующие предложения, содержащие разные формы сравнения, и переведите их на русский язык.

1) The longer the wire, the greater is its resistance to a current flow.

2) The differences of these two substances are more noticeable than their similarities.

3) The supermagnet creates a magnetic twice as strong as that from a conventional iron-core electromagnet.

Задание 4.

Перепишите и письменно переведите предложения на русский язык, обращая внимание на перевод неопределенных и отрицательных местоимений.

1) Our device was in operation for some 10 years.

2) No expansion takes place as the steam flows through the blading.

3) Any current can flow in this circuit.

Задание 5.

Перепишите следующие предложения, определите в них видовременные формы глаголов и укажите их инфинитив; переведите предложения на русский язык.

1) Heat changed water into vapour.

2) Tomorrow the representative of our company will test the ordered device.

3) When does mutual inductance take place?

Задание 6.

Перепишите и письменно переведите первые 2 абзаца текста.

Conductivity

Current may pass through solid conductors, liquids, gases or any combination of these. Some substances like metals, for example, conduct electricity easily. Such substances as copper, silver, aluminum carry an electric current very well. They have very low resistance. Other substances, like rubber, glass, porcelain conduct electricity poorly. They have an extremely high resistance. The ability of a conductor to pass electric charges is called conductance or conductivity.

The opposition which a material offers to the flow of current is known as resistance. If the opposition is small, conductivity is good and the body is classed as a conductor. When resistance is high, conductivity is poor, and the substance is classed as a poor conductor or a good insulator. Thus, the greater conductivity a substance has, the less is its resistance. So we can say that conductivity is inversely proportional to resistance. The best conductor has the least resistance; quite opposite, the poorest conductor has the greatest resistance. Conductance depends upon four things, namely: the material of a conductor, its length, diameter and its temperature.

There is a great difference in conductance of various substances. All metals conduct current easily, but copper carries current more easily than iron, and silver is the best conductor. Therefore, silver has a greater conductance than copper.

The unit used for measuring conductivity is the siemens. Resistance and conductors are related. Conductance is I divided by resistance and vice versa:

Resistance = I / conductance

Задание 7.

Ответьте письменно на следующие вопросы:

1. Do all substances conduct electricity?

2. What materials conduct an electric current well?

3. What is conductance?

4. What property of a substance is the opposition to conductance?

5. What is the relation between resistance and conductance?

6. Which conductor carries current more readily?

Задание 8. Ответьте письменно, правдиво ли следующее утверждение? Если нет, то почему:

Conductance depends upon three things, namely: the material of a conductor, its diameter and its temperature.