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246 ⏐⏐⏐ SERIES-PARALLEL NETWORKS
R1 I1 V b
R 5
4 �
R 2
R 3
+24 V
I
FIG. 7.70
Problem 7.
6 � R3 E 20 V
I1 R 1
R 2
3 �
I 2
3 �
I2 2 �
10 �
I3 I
R4 3
6 �
FIG. 7.72
Problem 9.
–8 V
V a
3 �
+ 20 V
5 �
I 1
FIG. 7.69
Problem 6.
16 �
25 �
S
S P P
6. Determine the currents I 1 and I 2 for the network of Fig.
7.69.
– 7 V
7. a. Find the magnitude and direction of the currents I, I1, I2, and I3 for the network of Fig. 7.70.
b. Indicate their direction on Fig. 7.70.
*8. For the network of Fig. 7.71:
a. Determine the currents Is, I1, I3, and I4. b. Calculate Va and Vbc. R 4
V a
I4 14 � R5 c
20 �
R2 b
R1 10 � 20 V R3 5 �
I 1 Is
FIG. 7.71
Problem 8.
6 �
9. For the network of Fig. 7.72:
a. Determine the current I 1.
b. Calculate the currents I 2 and I 3.
c. Determine the voltage levels V a and V b.
I 3
I 2