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842 ⏐⏐⏐ NETWORK THEOREMS (ac)
100I
R 1
–
20V
+
10 k�
E1 = 120 V ∠ 0°
–
X C
1 k�
Th
R 2 10 k� X L 5 k�
FIG. 18.123
Problems 18 and 33.
+
R
10 �
X L
(a)
8 �
Th
*14. Find the Thévenin equivalent circuit for the portions of
the networks of Fig. 18.122 external to the elements
between points a and b.
X C
8 �
X C
R 2
I =
0.5 A ∠ 60° Z L
a
10 �
10 �
+
I = 0.6 A ∠ 90° R1 9 �
I2 =
0.8 ∠ 60°
E = 20 V ∠ 40°
–
b
X C
0.2 k�
R 1 40 k� R 2 5 k�
FIG. 18.124
Problems 19 and 34.
Th
XL (b)
FIG. 18.122
Problems 14 and 28.
4 k�
a
b
*15. a. Find the Thévenin equivalent circuit for the network
external to the resistor R2 in Fig. 18.111.
b. Using the results of part (a), determine the current i of
the same figure.
16. a. Find the Thévenin equivalent circuit for the network
external to the capacitor of Fig. 18.112.
b. Using the results of part (a), determine the voltage VC for the same figure.
*17. a. Find the Thévenin equivalent circuit for the network
external to the inductor of Fig. 18.113.
b. Using the results of part (a), determine the current I of
the same figure.
18. Determine the Thévenin equivalent circuit for the network
external to the 5-k� inductive reactance of Fig.
18.123 (in terms of V).
19. Determine the Thévenin equivalent circuit for the network
external to the 4-k� inductive reactance of Fig.
18.124 (in terms of I).