Exercise 1. Answer the questions

Exercise 1. Answer the questions

1. What are elements with a definite value of inductance called?

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

3. What units is the value of mutual inductance measured in?

4. Do conductors have any value of inductance?

5. What does the inductance of a conductor show?

6. What type of coils is used for low-frequency currents?

 

Exercise 2. Choose the correct answer

1. Any conductor has …             a) some definite value of resistance

b) some definite value of inductance

2. Any conductor can provide … a) induced voltage

b) electric power

3. Elements with a definite value of inductance are called …

4. The inductance of a coil de- pends on its …

a) inductors

b) coils

a) size and material

b) size, material, core, number of turns

5. An iron core …                       a) increases the value of inductance

b) decreases the value of inductance

6. The value of mutual induct- ance is measured in …

a) watts

b) henries

PART 2.

       CIRCUIT DIAGRAMS AND CIRCUIT COMPONENTS         

Unit 1. Circuit diagrams and component layouts Vocabulary

actual                                    фактический, реальный

to arrange                             располагать, размещать

blob                                      маленький шарик

capacitance                           емкость

circuit diagram                     принципиальная схема

controls                                элементы управления

to draw                                 чертить, рисовать

drawing                                рисунок, чертеж

input                                     вход, ввод

junction                                соединение

to label                                 помечать, обозначать

layout                                   расположение, компоновка

to make sure                         убедиться, обеспечить

to omit                                  пропускать, не включать

output                                   выход, вывод

variable                                переменный

 

Text

Circuit diagrams show how circuit components are connected to-

gether. Each component is represented by a symbol. All wires are shown as straight lines. The actual layout of the components is usually quite different from the circuit diagram. A circuit diagram is useful when testing a circuit and for understanding how it works. When drawing circuit diagrams:

· Make sure you use the correct symbol for each component.

· Draw connecting wires as straight lines (use a ruler).

· Put a “blob” (•) at each junction between wires.

· Label components such as resistors and capacitors with their values.

· The positive (+) supply should be at the top and the negative (-) sup- ply at the bottom. The negative supply is usually labeled 0V, zero volts.

· Try to arrange the diagram so that signals flow from left to right: in- puts and controls should be on the left, outputs on the right.

· You may omit the battery or power supply symbols, but you must in- clude (and label) the supply lines at the top and bottom.

In the table below you will find some circuit components, their sym- bols and their functions in circuits.