Difference between A.C. and D.C.

Методические указания для самостоятельной работы

Бакалавров заочного обучения

по направлению 110800 Агроинженерия

профиль Электрическое оборудование и электротехнологии

УФА – 2012

УДК 811

ББК 81.2 Англ

М 54

Рекомендовано к изданию методической комиссией энергетического факультета Башкирского ГАУ, протокол № от ноября 2012 года

Составитель: к.с.н., доцент кафедры зарубежных языков

Р.М. Нутфулина

Рецензент: к.ф.н., доцент кафедры зарубежных языков Г.С. Тукаева

Ответственный за выпуск: заведующий Difference between A.C. and D.C. кафедрой зарубежных языков, к.ф.н., доцент О.Н. Новикова

От создателя

Цель сборника – знакомство и обучение бакалавров направления «Агроинженерия» развитию способностей самостоятельной и аудиторной работы над литературой по данному направлению, умению осознавать и переводить научно-технические тексты, что соответствует требованиям программки по британскому языку и рассчитано на бакалавров, имеющих Difference between A.C. and D.C. исходную языковую подготовку.

Все тексты подверглись адаптации и сокращению. Задания содействуют усвоению и закреплению лексики и предстоящему развитию беспереводного осознания текстов на британском языке.

Помощь при переводе текстов может оказать терминологический словарь, включенный в сборник.

Contents

1 Direct current and alternating current
2 Difference between A.C. and D.C.
3 Two Difference between A.C. and D.C. main types of circuit connection
4 Resistance and Resistivity
5 Measuring units and instruments
6 Conductors
7 Semi-conductors
8 Dynamo
9 Relays
10 Electric cells
11 Capacitors
12 Transmission of electric power
13 Transformers
14 The atomic power plant
15 The operation of atomic power plant
16 Electric lines and their efficiency
17 Electric power
18 Thermal electrical plants
19 How electricity is generated
20 Sources Difference between A.C. and D.C. of electrical energy
21 Electric shock. Safety electric system
English – Russian vocabulary

Direct current and alternating current

We know that current is the flow of electricity through a circuit. There are two main types of current: direct and alternating. When electrons flow in one direction only, the current is called a direct current Difference between A.C. and D.C.. When electrons flow first in one direction and then in another in a periodic manner, the current is called an alternating current. An alternating current is a current that changes its direction of flow through a circuit in a periodic manner. Alternating current flows in cycles. The number of Difference between A.C. and D.C. cycles per second is termed the frequency of current. In a 60-cycle alternating current circuit, the current flows in one direction 60 times per second and in the other direction 60 times per second.

A standard frequency has a great advantage since different electrical systems can be interconnected.

(670)

1.1 Test. Choose the Difference between A.C. and D.C. correct variant

1. Direct current …

a) changes its direction of flow

b) flows in one direction

2. The frequency of the circuit is …

a) the number of cycles per minute

b) the number of cycles per second

3. A standard frequency has …

a) great advantages

b) disadvantages

Answer the questions

1. What is current?

2. What types of current do you Difference between A.C. and D.C. know?

3. What type is termed a direct current ( an alternating current)?

4. In what manner does an alternating current flow?

5. What is frequency?

Difference between A.C. and D.C.

A direct current (D.C.) flows continuously through a conducting circuit in one direction only. It is unidirectional in character. An Difference between A.C. and D.C. alternating current (A.C.) continually reverses in direction. Starting from zero, it grows in one direction, reaches a maximum, dies down to zero again. Then it rises in the opposite direction, reaches a maximum, again dying down to zero. It is thus changing in magnitude and in direction.

High Difference between A.C. and D.C. voltages are desirable for the economic transmission of a given amount of electric power. If the transmission voltage is 100 volts the current must be 10,000 amperes. If the transmission voltage is 10,000 volts the current is only 100 amperes. The cross – section of the cables transmitting the power is determined by Difference between A.C. and D.C. the current.

There is the most important factor that it is easy to transform a.c. power from one voltage to another by means of transformer. The transformer also enables to step down voltage at the receiving end of the transmission line.

(820)

2.1 Translate the following word combinations used in Difference between A.C. and D.C. the text: in one direction only, unidirectional, in the opposite direction, economic transmission, amount of electric power, high-voltage cable, by means of transformer, transmission line.

Answer the questions

1. What is the difference between A.C. and D.C.?

2. What are high voltages desirable for?

3. Why is high-voltage Difference between A.C. and D.C. cable cheaper?

4. What is transformer used for?


diapazoni-ballov-kvalifikacionnih-kategorij.html
diapazoni-znachenij-celih-chisel-so-znakom.html
diastereomeriya.html