The circuit connected to the voltage source is called

Coupling

Transformer coupling -electromagnetic fields -

Put down Russian equivalents of these word combinations. Then translate them back into English.

Constant

Put down the words with the opposite meaning and translate them into Russian.

Model: inconstant

inactive-inconsistent unable -inability —

incompetent -

incorrect - ____

indirect - _____

indefinite -

loose coupling -tight coupling -

When circuits are indirect-inductively coupled energy is transferred from one circuit to another using electromagnetic field of the induc­tance through which a varying current is flowing. The coupling device is a transformer. It is not in series with the elements of the circuit, therefore the coupling is indirect. The transformer consists of two windings: the primary and the secondary. The primary circuit is con­nected to the voltage source, the secondary - to the load circuit.

The coupling may be tight and loose. In case the coils of the cour> ling element are close together, the coupling is tight. In case the coils are separated the coupling is loose. In the loose coupling the mutual in­ductance is small compared with the self-inductance.

5. When the coils are close to- a) the coupling is loose, gether b) the coupling is tight.

6. The circuits are indirectly a) the coupling element is common to coupled when both circuits and is in series with their

other elements, b) the coupling element is not common to the circuits and is not in series with their other elements.

5. Complete these sentences using while. Follow the model on page 13.

1. The circuit receiving energy is the secondary circuit....

2. The coupling is loose when the coils are separated.............

3. When the coupling element is not common to the circuits and not in se­ries with their elements, the circuits are indirectly coupled.....................................................................................................

6. Answer the following questions:

1. What type of circuit is called the primary?

2. What type of circuit is called the secondary?

3. What is the function of a coupling element?

4. What type of coupling is called loose?

5. What type of coupling is called tight?

6. In what case are the circuits directly coupled?

7. In what case are the circuits indirectly coupled?

8. What is the difference between a tight and loose coupling?

9. In what case should a coupling element be substituted?

7. Pair work. Draw a scheme of 1) a loose coupling, 2) a tight coupling.
Describe the schemes to your groupmate.

4. Complete the sentences using the correct variant:

a) the secondary circuit. b) the primary circuit.

2. The circuit receiving its en­ergy through a coupling is

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