Inductance

Any conductor has some definite value of inductance. The inductance of a conductor shows how well it can provide induced voltage. Elements of a circuit with a definite value of inductance are coils of wire called inductors. The inductance of a coil depends upon its size and material. The greater the number of turns of a coil the higher is its inductance.

An iron core also increases the value of inductance. Coils of this type are used for low frequency currents while coils with an air core are used for high frequency currents. The primary and the secondary coils have mutual inductance. Mutual inductance is measured in the same units as inductance, that is in henries.

1. What does an inductance show?

2. What does an inductance of a coil depend on?

3. What type of coils increases the value of inductance?

2. Find the correct variant.

The circuit connected to the voltage source is called

a) Secondary circuit

b) Primary circuit

The circuit receiving its energy through a coupling is

a) A primary circuit

b) A secondary circuit

The function of a coupling elements is

a) To separate the circuits

b) To transfer energy

c) To prevent a short between the circuits

When the coupling is tight

a) The coupling are separated

b) The coils are close together

When the coils are close together

a) The coupling is loose

b) Te coupling is tight

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

Filter, choke coil, by-pass, high-pass, low-pass, oppose, on the other hand, consist of, direct current, capacitor

Additional material for card № 10

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

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