VI. Tell about alternating current electro motors

VII.   Form following offers according to model

Model: -Steam does mechanical work. It loses heat energy.

-While (when) doing mechanical work, steam loses heat energy.

1. An electric motor docs mechanical work. This motor must overcome some force.

2. Motors work in exposed situations. They require eclosure of working parts.

3. Greek philosophers discussed the structure of matter. They called its smallest particles atoms.

4. Yablochkov experimented with various materials. He wanted to find some substance glowing in a vacuum.

VIII. Translate into English

Разнообразие (множество), виток толстой проволоки, разделить на... проводимость, различаться (в) чем-либо, управлять, вращающийся момент, щетка, измерять, трансформатор, катушка, ток, уравнение, элемент (батарея), водород, сердечник, обматывать, нагрузка, постоянный ток, переменный ток.

IX. Answer the questions.

1. Types of alternating-current circuits?

2. Two kinds of alternating-current circuits?

3. What is the induction motor?

4. The parts of induction motor?

5.  What is the squirrel-cage rotor?

 

 

ПРАКТИЧЕСКАЯ РАБОТА № 22

ELECTRIC GENERATORS AND MOTORS

Цель: Введение и активизация лексики по теме «Электрические генераторы и моторы».

Оборудование: комплект тестов, раздаточный материал, иллюстрации по теме.

Vocabulary

I. Learn the words and expressions.

 

A device          прибор

To convert           превращать, переводить

Reverse                 обратный, перевернутый

Enormous            чрезмерный

A turbine             турбина

To transform       превращать, преобразовывать

To transmit          передавать

To furnish            снабжать, предоставлять

A capacity            емкость, мощность, производительность

Welding               сварка

Lighting               освещение

Communication   связь

 

II. Read the text. Translate and retell in Russian.

                  Electric generators and motors

 A device for converting mechanical energy into electric energy is called a generator. The function of a motor is just the reverse, that is, it transforms electric energy into mechanical energy. The enormous energy of steam engines, gas engines, and water turbines can now be transformed into electricity and transmitted many miles. The generator has revolutionized modem industry by furnishing cheap electricity.

The essential parts of a generator are: a) the magnetic field, which is produced by permanent magnets or electromagnets, and b) a moving coil of copper wire, called the armature, wound on a drum.

D.C. generators are used for electrolytic processes. Large d.c. generators are used in certain manufacturing processes, such as steel marking. Generators of small capacities are used for various special purposes, such as welding, automobiles generators, train lighting, communication system, etc.

III. Find English equivalents.

Прибор, турбина, емкость, снабжать, превращать, связь, сварка, освещение, передавать.

 

IV. Finish the sentences.

1. A device for converting mechanical energy into electric energy is called……

2. The generator has……………….

3. The function of a motor is…………..

4. The essential parts of a generator are……………

5. D.C. generators are used………….

6. Generators of small capacities are used……………

V. Pick up synonyms from the text to the given words

to do -                               to supply -

to convert -                        to manufacture -

to name -                           units -

VI. Define in what time there are verbs-predicates in the given offers. Translate the sentences into Russian

 

1. Both driving and driven units may operate under good conditions.

2. Single-cylinder condensing turbines arc built in sizes up to 30,000 kW at 3,600 rpm and 100,000 kW at 1,800 rpm.

3. Single-cylinder non-condensing units have been built for 65,000 kW output at 3,600 rpm.

4. The coils of a transformer are called high-voltage and low-voltage windings, or primary and secondary windings.   

5. Steam, gas and oil engines were known and used prior to the invention of diesel engines.