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782 ⏐⏐⏐ METHODS OF ANALYSIS AND SELECTED TOPICS (ac)<br />

E1 = 20 V ∠ 0°<br />

–<br />

+<br />

V<br />

–<br />

rp –<br />

28 V<br />

+<br />

+<br />

5 � 4 �<br />

R1 5 �<br />

6 �<br />

5 k�<br />

6 �<br />

(a)<br />

R p<br />

4 �<br />

FIG. 17.66<br />

Problem 9.<br />

+<br />

E 1 = 60 V ∠ 0°<br />

–<br />

8 �<br />

10 k�<br />

+<br />

3 �<br />

R L<br />

X L<br />

4 �<br />

+<br />

+<br />

E2 = 40 V ∠ 60°<br />

–<br />

E1 = 25 V ∠ 0°<br />

–<br />

FIG. 17.65<br />

Problems 8, 18, and 19.<br />

I L<br />

1 k�<br />

+<br />

V L<br />

4 k�<br />

–<br />

R 1<br />

3 �<br />

15 �<br />

1 �<br />

6 �<br />

(a)<br />

*7. Write the mesh equations for the networks of Fig. 17.64.<br />

Determine the current through the resistor R 1.<br />

E 10 �<br />

1 = 220 V ∠ 0° E2 = 100 V ∠ 90°<br />

–<br />

–<br />

(b)<br />

4 �<br />

15 �<br />

FIG. 17.64<br />

Problems 7, 17, and 35.<br />

2 �<br />

R 1<br />

8 �<br />

+<br />

10 �<br />

20 �<br />

6 �<br />

5 �<br />

+<br />

E2 = 120 V ∠ 120°<br />

–<br />

*8. Write the mesh equations for the networks of Fig. 17.65.<br />

Determine the current through the resistor R 1.<br />

(b)<br />

10 �<br />

15 �<br />

5 �<br />

9. Using mesh analysis, determine the current I L (in terms<br />

of V) for the network of Fig. 17.66.<br />

R 1<br />

20 �<br />

80 �<br />

N A<br />

+<br />

E2 = 75 V ∠ 20°<br />

–<br />

20 �

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