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Th PROBLEMS ⏐⏐⏐ 841
11. Find the voltage V s for the network of Fig. 18.119.
SECTION 18.3 Thévenin’s Theorem
12. Find the Thévenin equivalent circuit for the portions of
the networks of Fig. 18.120 external to the elements
between points a and b.
3 �
+
E = 100 V ∠ 0° XL –
*13. Find the Thévenin equivalent circuit for the portions of
the networks of Fig. 18.121 external to the elements
between points a and b.
I = 0.1 A ∠ 0°
R 1
X L
R
20 �
XC 20 �
(a)
(a)
a
b
32 �
a
4 � X C 2 �
b
R 2 = 68 �
–
Vx +
R 1
+
E1 –
FIG. 18.120
Problems 12 and 26.
E = 50 V ∠ 0°
FIG. 18.121
Problems 13 and 27.
10 �
10 V∠0°
+
E = 20 V ∠ 0°
–
+
–
R 2
2 �
+
4Vx –
FIG. 18.119
Problem 11.
R
2 k�
X C
R 1
4 �
(b)
(b)
2 � 8 �
R2 X L
I
10 �
X L
3 k�
6 k�
X C2
b
5 A∠0° Vs –
X C1
6 �
a
b
a
R L
+