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318 ⏐⏐⏐ METHODS OF ANALYSIS AND SELECTED TOPICS (dc)
I
R s
4 mA
1 k�
100 k�
200 k�
FIG. 8.120
Problem 46.
R1 R2 1 k� 9 V
R 3
R 4
Rs 1 k� R1 2 k� R2 R5 E
20 V
200 k�
100 k�
2 k�
10 V R3 2 k�
2 k� R4 2 k�
I
(a)
2 �
3 �
(a)
1 �
I
FIG. 8.121
Problem 47.
2 �
4 �
8 V
FIG. 8.122
Problem 48.
45. For the bridge network of Fig. 8.119:
a. Write the nodal equations using the format approach.
b. Determine the current across R5. c. Is the bridge balanced?
d. Is Equation (8.4) satisfied?
46. Write the nodal equations for the bridge configuration of
Fig. 8.120. Use the format approach.
*47. Determine the current through the source resistor R s of
each network of Fig. 8.121 using either mesh or nodal
analysis. Discuss why you chose one method over the
other.
R s
2 A
10 �
10 �
(b)
R 2
20 �
R1 R4 10 �
R5 R 3
20 �
20 �
SECTION 8.12 Y-D (T-p) and D-Y (p-T) Conversions
48. Using a D-Y or Y-D conversion, find the current I in each
of the networks of Fig. 8.122.
I
4.7 k�
6.8 k�
6.8 k� 6.8 k�
(b)
1.1 k�
N A