Types of coupling

When circuits are indirect-actively 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 coupling elements 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.

1. What types of coupling do you know?

2. What kinds of windings are there in the transformer?

3. Which winding is connected to the voltage source?

2. Find the correct variant.

A filter is used in order

a) to separate d.c. from a.c.

b) to transfer energy from the primary to the secondary

c) to separate low frequencies from high frequencies

A filter consists of

a) a resistor and a transformer

b) a choke coil and a capacitor

c) an inductance coil and a capacitor

Direct current easily passes

a) through a choke coil

b) through a capacitor

Alternating current easily passes

a) through a capacitor

b) through a choke coil

Low-pass filter is used

a) to pass high frequencies and to prevent the flow of low frequencies

b) to pass low frequencies and to prevent the flow of high frequencies

3. Make up sentences, using words and word-combinations.

Electron tubes, are placed into a, contains, operates, the cathode, electrons, collects, controls the flow of electrons, oscillate, the function

Additional material for card № 11

1. Read the text, translate it and answer the questions.

Не знайшли потрібну інформацію? Скористайтесь пошуком google:

Генерація сторінки за: 0.005 сек.