Pair work. Make up similar problems of your own. Ask your groupmate to solve them.

 

 

Unit Five [5]

1. a) Cover the right column and read the English words. Translate them into Russian and check your translation.

b) Cover the left column and translate theRussian words back into English.

circuit	[ˈsəːkɪt]	цепь, контур
conductor	[kənˈdʌktə]	проводник
function	[ˈfʌŋkʃn]	назначение
difference	[ˈdɪfrəns]	разница
open		обрыв
short		короткое замыкание
trouble	[ˈtrʌbl]	повреждение
no	[nou]	никакой, нисколько
to reduce	[rɪˈdjuːs]	сокращать
to supply	[səˈplaɪ]	снабжать
to connect	[kəˈnekt]	связывать
to compare (with)	[kəmˈpɛə]	сравнивать (с)
to pass through	[ˈpɑːsˈθruː]	проходить через
toresultin		приводить к, иметь результатом
toresultfrom		следовать, проистекать из

2. Translate into Russian:

1. An open and a short are troubles in a circuit.

2. A trouble in a circuit results in no current in it.

3. What does an open in a circuit result in?

4. What does a short in a circuit result in?

5. What does a trouble in a circuit result from?

Electric Circuit

This is a circuit. Its elements are a voltage source, a resistor and a conductor. The circuit consists of a voltage source, a resistor and a conductor. A voltage source supplies current. A resistor reduces current. A conductor connects the elements of the circuit.

Compare circuit a with circuit b. What is the difference between them? Current passes through circuit a while no current passes through circuit b. Circuit b has an open. No current through circuit b results from an open. An open and a short are troubles in a circuit. A trouble in a circuit may result in no current in it.

 

3. Complete these sentences, using the correct variant:

1. Circuit a consists of	a) resistors and conductors. b) a voltage source and resistors. c) a voltage source, a resistor and a conductor.
2. A voltage source	a) conducts current. b) reduces current. c) supplies current.
3. A conductor	a) connects the elements. b) supplies voltage. c) conducts current.
4. A resistor	a) connects the elements. b) supplies current. c) reduces current.
5. No current results from	a) an open. b) a short.

4. Answer the following questions:

1. What elements does a circuit consist of?

2. What is the function of a voltage source?

3. What is the function of a conductor?

4. What is the function of a resistor?

5. When is there no current in a circuit?

6. What does an open or a short result in?

7. What does no current in a circuit result from?

 

5. Solve these problems:

1. How much is the current in the circuit if a 60-volt source is connected to a resistance of 1,600 ohms?

2. How much is the voltage in a circuit having a current equal to 25 amp, if a 25-ohm resistance is connected to it?

3. A 70.35-ohm resistance is connected to the circuit. How much is the voltage if the current equals 4.5 amp?

 

6. Pair work. Ask your groupmate to compare circuits a and b (see Fig. 1).

1. What do they have in common?

2. Which of the circuits has a trouble?

3. What does the trouble result from?

4. What does it result in?

 

Unit Six [6]

1. a) Cover the right column and read the English words. Translate them into Russian and check your translation.

b) Cover the left column and translate theRussian words back into English.

branch	[brɑːntʃ]	отвод
line		линия
value	[ˈvæljuː]	величина
voltagedrop		падение напряжения
series	[ˈsɪəriːz]	последовательное
parallel	[ˈpærələl]	параллельное
main	[meɪn]	главный, основной
touse	[juːz]	использовать
in order (to)		для того чтобы