III. Transformers

I .Words to be remembered

1. voltage - напряжение

2. to increase - увеличивать, увеличиваться

3. to decrease - уменьшать, уменьшаться

A transformer is used for increasing or decreasing voltage.

4. a winding - обмотка

5. a core - якорь

A transformer consists of two windings and an iron core.

6. primary - первичный

7. secondary - вторичный

The winding is connected to a source of supply and the secondary winding

is connected to a load.

8. a step-up transformer - повышающий трансформатор

A step-up transformer is used for increasing voltage.

9. a step-down transformer - понижающий трансформатор

A step-down transformer is used for decreasing voltage.

II. Fill in the blanks with suitable words

1. A transformer is used for increasing or decreasing ...

2. The principal parts of a transformer are two ... and an iron ...

3. A coil which is supplied with current is called a ... winding.

4. A winding from which current is taken is called a ... winding.

5. A ... consists of thin sheets of steel.

6. Voltage is increased by means of a ... transformer.

7. Voltage is decreased by means of a ... transformer.

step-up, core, secondary, winding, voltage, primary, step-down

III. Find suitable attributes from B for the nouns from A

A. iron, television, secondary, power, transmission, long, electric, principal, induction, step-down

B. current, station, coil, parts, core, winding, transformer, distance, line, set

IV. Translate and retranslate the sentences

1. A transformer is used for changing electric current from one voltage to another.

2. A simple transformer is a kind of an induction coil.

3. The principal parts of a transformer are two windings (coils) and an iron core.

4. A primary winding is connected to a source of supply.

5. A secondary winding is connected to a load.

6. A core consists of thin sheets of steel.

7. A step-up transformer is used for increasing voltage.

8. A step-down transformer is used for decreasing voltage.

9. Large transformers are used in long distance transmission lines.

V. Form sentences

1. A primary winding is ... 2. A step-up transformer is ... 3. A transformer is ... 4. A secondary winding is ... 5. A step-down transformer is ... 6. A core is ...	1. a ring of thin sheets of steel 2. a winding from which current is taken 3. a transformer for increasing voltage 4. a winding which is supplied with current 5. a device for changing electric current from one voltage to another 6. a transformer for decreasing voltage

VI. Read the text and be ready to answer the questions