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Th PROBLEMS ⏐⏐⏐ 843<br />

20. Find the Thévenin equivalent circuit for the network<br />

external to the 10-k� inductive reactance of Fig. 18.114.<br />

21. Determine the Thévenin equivalent circuit for the network<br />

external to the 4-k� resistor of Fig. 18.115.<br />

*22. Find the Thévenin equivalent circuit for the network<br />

external to the 5-k� inductive reactance of Fig. 18.116.<br />

*23. Determine the Thévenin equivalent circuit for the network<br />

external to the 2-k� resistor of Fig. 18.117.<br />

*24. Find the Thévenin equivalent circuit for the network<br />

external to the resistor R1 of Fig. 18.118.<br />

*25. Find the Thévenin equivalent circuit for the network to<br />

the left of terminals a-a� of Fig. 18.125.<br />

SECTION 18.4 Norton’s Theorem<br />

26. Find the Norton equivalent circuit for the network external<br />

to the elements between a and b for the networks of<br />

Fig. 18.120.<br />

27. Find the Norton equivalent circuit for the network external<br />

to the elements between a and b for the networks of<br />

Fig. 18.121.<br />

28. Find the Norton equivalent circuit for the network external<br />

to the elements between a and b for the networks of<br />

Fig. 18.122.<br />

*29. Find the Norton equivalent circuit for the portions of the<br />

networks of Fig. 18.126 external to the elements between<br />

points a and b.<br />

+<br />

–<br />

R 1<br />

6 �<br />

X L<br />

8 �<br />

a<br />

b<br />

R 2<br />

X C<br />

9 �<br />

E 20 V ∠ 0° ZL I2 = 0.4 A ∠ 20°<br />

12 �<br />

R2 –<br />

E<br />

+<br />

a<br />

1 k�<br />

8 V∠0°<br />

Ix 5Ix R1 2 k�<br />

R3 3.3 k�<br />

FIG. 18.125<br />

Problem 25.<br />

X L<br />

R1 = 3 � XC 4 �<br />

8 �<br />

+<br />

E1 = 120 V ∠ 30° R2 8 �<br />

–<br />

(a) (b)<br />

*30. a. Find the Norton equivalent circuit for the network<br />

external to the resistor R2 in Fig. 18.111.<br />

b. Using the results of part (a), determine the current I of<br />

the same figure.<br />

*31. a. Find the Norton equivalent circuit for the network<br />

external to the capacitor of Fig. 18.112.<br />

b. Using the results of part (a), determine the voltage VC for the same figure.<br />

*32. a. Find the Norton equivalent circuit for the network<br />

external to the inductor of Fig. 18.113.<br />

b. Using the results of part (a), determine the current I of<br />

the same figure.<br />

33. Determine the Norton equivalent circuit for the network<br />

external to the 5-k� inductive reactance of Fig. 18.123.<br />

FIG. 18.126<br />

Problem 29.<br />

R 3<br />

a<br />

R 4<br />

68 �<br />

b<br />

40 �<br />

+<br />

–<br />

a´<br />

Thévenin<br />

E 2 = 108 V ∠ 0°

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