a) results from a problem in 1 branch
b) results from a trouble in the main line
5. the sum of IR voltage drops
a) is equal to the value of voltage in the circuit
b) is less than the smallest voltage drib
c) is more the value of voltage in the circuit
B
Finish the sentences using the words with the contrary pregnant.
Grand o d due east 1: Resistors continued in. series have the same value of electric current �
Resistors continued in series have the same value of electric current while resistors connected in parallel have the same value of voltage.
1. Resistors connected in series have dissimilar values of voltage while... . 2. A trouble in ane element of a series circuit results in no current in the whole excursion while....
3. In order to accept. the same value of current in all the elements, a serial circuit is used while.... 4. No current in a parallel circuit results from a trouble in the main line while....
C
Answer the following questions:
1. What type of circuit has the main line and parallel branches? ii. What type of circuit is used in social club to have the same value of current in all the elements? 3. What blazon of circuit is used in society to have the same value of voltage in all the elements? 4. What does a trouble in the main line result in? 5. What does a problem in a branch result in? 6. What does no current in a series circuit upshot from? seven. How much is the sum of IR voltage drops equal to? 8. What is the departure between series and parallel circuits?
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�
1-b; 2-b; iii-a; iv-b; five-a.
�
ane. in parallel.......... the aforementioned
2. parallel.............. in that chemical element simply
3. voltage................ parallel
4. series.................. in one chemical element.
�
ane. parallel
2. series
3. parallel
iv. no electric current in the whole circuit
5. no electric current in that co-operative
vi. an open or a short
seven. the value of voltage in the circuit
8. the resistors are connected in series; .. .in parallel.
Lesson 3 |
An Open in a Parallel Circuit |
any | calorie-free |
since | bulb |
'operate | advantage |
An open in any circuit results in no electric current. In parallel circuits there is a divergence betwixt an open in the main line and an open up in a branch: an open in the main line of a circuit of this blazon results in no current in the whole circuit while an open in a parallel co-operative results in no current in that branch only.
Let the states take ii parallel circuits "a" and "b" and compare them. Circuit "a" and circuit "b" are used to lite bulbs. The first excursion consists of the main line and three parallel branches. No seedling continued across this circuit can light since it has an open in the primary line.
Excursion "b" consists of the same elements as the excursion a". It has an open � not in the principal line but in one of the branches. Since the open branch has no current, a bulb continued across information technology cannot light. In all the other branches current passes, since each branch is connected to the voltage source. Bulbs connected across these branches can low-cal. This shows the reward of a parallel circuit, since an open up in one element opens only one branch while all the other branches tin can operate.
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������� 2 ������������ ���� �a� � �b� � ������� ��. ���� �� � ���� �b� ������������ ��� ��������� ����. ������ ���� ������� �� ������� ����� � ���� ������������ ������. �� ���� ����� � ���� ���� �� ����� ����������, ���� ���� ������ � ������� �����.
���� �b� ������� �� ��� �� ���������, ��� � ���� ��. ��� ����� ������ � �� � ������� �����, � � ����� �� ������. ��������� � ����������� ����� ��� ����, �����, ����������� � ���, �� ����� ����������. �� ���� ��������� ������ ��� ����, �. �. ������ ����� ��������� � ���������� �������. �����, ����������� � ����� �������, ����� ������. ��� ���������� ������������ ������������ ����, �. �. ������ � ����� �������� ��������� ������ ���� �����, � �� ����� ��� ��� ��������� ����� ����� ��������.
EXERCISES
A
Answer the following questions:
1. Why can circuit "b" operate? two. What does no current
in circuit "a" result from? 3. What is the advantage of a parallel circuit?
B
Solve the following problems:
ppose that you accept a series circuit consisting of three resistors and a voltage source. R1= 0.18 ohm, R2 =i.xv ohm, R3 = 2 ohms, I = 10 amp. Notice the voltage drop across each resistor; find the value of voltage in the ppose R1 gets open up. What does it consequence in?
ii. Two resistors are continued in serial. R1 = seven,000 ohms, R2 = ii,200 ohms, I = 110 amp. Find the voltage drop beyond each ppose no current passes through the circuit, what does it result from?
������ � �������
A
1. an open up in one element opens just one branch
2. all the other branches can operate.
�
ane.V1 =0.18x10= ane.8V; V2= one.15 x 10= eleven.5V; V3 = ii ten x = 20V. 5= 1.8 + 11.5 + xx =
=33.5V V = 31.5V.
2. 6 = vii,000 10 110 = 770,000V; V2 = 2,200 10 110 = 242,000V. An open up or a short.
Lesson 4 |
METERS |
meter | Ane |
Battery | Common |
Scale | should |
readings | measure |
The well-nigh common meters used are the ohmmeter, the ammeter and the voltmeter. The ohmmeter is used to measure out the value of resistance. It consists of a milliammeter calibrated to read in ohms, a battery and resistors. The meter is continued in parallel and the circuit is non opened when its resistance is measured. The readings on the scale show the measured value. The ammeter is used to mensurate the value of electric current. When the ammeter is used the circuit should be opened at one betoken and the terminals of the meter should be con�nected to it. I should take into consideration that the positive terminal of the meter is connected to the positive terminal of the source; the negative terminal � to the negative terminal of the source. The ammeter should be connected in series. The readings on the scale testify the measured value.
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��������� ������������ ��� ��������� �������� ����. ��� ������������� ���������� ���� ���� ��������� � ����� ����� � ��������� �� � �������� �������. ���� ���������, ��� ������������� �������� ������� ����������� � ������������� ���������� ���������, � ������������� �������� � � ������������� ���������� ���������. ��������� ���� ������������ ���������������. ��������� �� ����� ���������� ���������� ��������.
EXERCISES
A
Find the right variant. Call back it:
ane. the ammeter is
a) a common meter
b) an uncommon meter
ii. in order to measure the value of current
a) the ohmmeter is used
b) the voltmeter is used
c) the ammeter is used
3. a meter has
a) positive terminals only
b) negative terminals only
c) positive and negative terminals
4. when the ammeter is used
a) the circuit should be opened
b) the circuit should not be opened
five. the ammeter should be connected
a) in series
b) in parallel
6.1 should take into consideration that
a) the positive last should be connected to the negative
terminal
b) the positive terminal should be continued to the positive
terminal of the source
B
Cease the sentences using the words with the opposite pregnant:
1. The ohmmeter is used to measure the value of resistance
2. The ammeter is continued in series
3. When the ammeter is used to measure the value of electric current
the circuit should be opened
C
Answer the post-obit questions
I. What is the ammeter used for? 2. What is the voltmeter used for? 3. What is the ohmmeter used for? 4. What terminals has a meter? 5. Should the measured circuit be opened when the voltmeter is used? 6. Should the measured circuit be opened when the ammeter is used? vii. In what style should the voltmeter be continued to the excursion? 8. In what mode should the ammeter be continued to the excursion? 9. What is the departure betwixt a voltmeter and an ammeter? 10. What common meters are used to measure the values in a circuit?
D
Solve the following problems:
1.Suppose the ammeter calibration reads ane.9 amp, the voltmeter
calibration reads 2.4 Five; how much is the value of resistance
in the measured circuit?
two.Suppose the ohmmeter scale reads 75 ohms, the voltmeterscale reads 220 V; how much is the value of current in the measured circuit?
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A
1-a; 2-�; 3-�; 4-a; 5-a; half-dozen-b.
�
1. the ammeter.................. current.
2. the ohmmeter............. parallel.
3. the ohmmeter............. resistance... .is not opened.
�
i. to mensurate the value of electric current
ii......................................... voltage
3......................................... resistance
4. positive and negative
5. -
6. yes
vii. -
eight. in series
ix. -
10. the ohmmeter, the ammeter, the voltmeter.
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