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*28. For the network of Fig. 5.97, determine the voltages:
a. Va, Vb, Vc, Vd b. Vab, Vcb, Vcd a
2 k�
b
c. Vad, Vca 44 V
4 k�
*29. For the integrated circuit of Fig. 5.98, determine V 0, V 4,
V 7, V 10, V 23, V 30, V 67, V 56, and I (magnitude and direction).
*30. For the integrated circuit of Fig. 5.99, determine V 0, V 03,
V 2, V 23, V 12, and I i.
SECTION 5.8 Internal Resistance of Voltage Sources
31. Find the internal resistance of a battery that has a no-load
output voltage of 60 V and that supplies a current of 2 A
to a load of 28 �.
32. Find the voltage VL and the power loss in the internal
resistance for the configuration of Fig. 5.100.
33. Find the internal resistance of a battery that has a no-load
output voltage of 6 V and supplies a current of 10 mA to
a load of 1/2 k�.
SECTION 5.9 Voltage Regulation
34. Determine the voltage regulation for the battery of Problem
31.
35. Calculate the voltage regulation for the supply of Fig.
5.100.
I
E
–8 V
4 �
–2 V
I i
20 V
5 mA
20 V
2
1
FIG. 5.97
Problem 28.
20 V
6 mA
2 k�
4 5
3 6
1
0
FIG. 5.98
Problem 29.
2
3
FIG. 5.99
Problem 30.
R int = 0.05 �
E = 12 V
PROBLEMS ⏐⏐⏐ 167
–2 V
7
0
c
6 k�
d
2 mA
10 mA
+
V L
–
FIG. 5.100
Problems 32 and 35.
4 V
3 k�
1 k�
3.3 �