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164 ⏐⏐⏐ SERIES CIRCUITS S<br />

E<br />

100 V<br />

40 V<br />

R 1<br />

2 �<br />

24 V<br />

20 V<br />

R 2<br />

4 �<br />

FIG. 5.84<br />

Problem 14.<br />

4 k�<br />

2 k�<br />

25 �<br />

(a)<br />

(a)<br />

(c)<br />

6 k�<br />

24 W<br />

a<br />

R = ?<br />

50 � Vab b<br />

1 k�<br />

R<br />

+<br />

4 V<br />

–<br />

a<br />

b<br />

2 k�<br />

3 k�<br />

V ab<br />

80 V<br />

FIG. 5.85<br />

Problems 15 and 37.<br />

200 V<br />

FIG. 5.86<br />

Problem 16.<br />

*14. For the conditions specified in Fig. 5.84, determine the<br />

unknown resistance.<br />

SECTION 5.6 Voltage Divider Rule<br />

15. Using the voltage divider rule, find Vab (with polarity) for<br />

the circuits of Fig. 5.85.<br />

+<br />

20 � 10 � a 4 � b<br />

2.5 �<br />

0.36 V<br />

a<br />

V ab<br />

(b)<br />

1.5 �<br />

0.5 � b 0.9 �<br />

(d)<br />

3 �<br />

V = 140 V<br />

R<br />

(b)<br />

–<br />

6 �<br />

V ab<br />

0.6 �<br />

6 �<br />

16. Find the unknown resistance using the voltage divider<br />

rule and the information provided for the circuits of Fig.<br />

5.86.

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