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N A
*16. For the transistor configuration of Fig. 8.108:
a. Solve for the currents I B, I C, and I E using the fact that
V BE � 0.7 V and V CE � 8 V.
b. Find the voltages V B, V C, and V E with respect to
ground.
c. What is the ratio of output current I C to input current
I B? [Note: In transistor analysis this ratio is referred to
as the dc beta of the transistor (b dc).]
SECTION 8.7 Mesh Analysis (General Approach)
17. Find the current through each resistor for the networks of
Fig. 8.104.
18. Find the current through each resistor for the networks of
Fig. 8.105.
19. Find the mesh currents and the voltage Vab for each network
of Fig. 8.106. Use clockwise mesh currents.
20. a. Find the current I3 for the network of Fig. 8.107 using
mesh analysis.
b. Based on the results of part (a), how would you compare
the application of mesh analysis to the branchcurrent
method?
*21. Using mesh analysis, determine the current through the
5-� resistor for each network of Fig. 8.109. Then determine
the voltage Va. 4 V
E1 R1 R
E3 5
1 �
5 �
R 3
V
a
3 �
R 4
6 V
15 V
R2 1 �
E2 10 �
V CC
FIG. 8.109
Problems 21 and 29.
I B
+
20 V
–
R B
270 k�
R 3 = 5 �
R
6 � 5
R1 = 4 � R4 3 �
E 1
12 V
(a) (b)
R E
I C
C
B +
8 V
+ –
0.7 V
–
E
IE 510 �
FIG. 8.108
Problem 16.
V a
R 2 = 2 �
E 2 16 V
PROBLEMS ⏐⏐⏐ 313
R C
2.2 k�
V CC
+
20 V
–