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S<br />

S P P<br />

10. For the network of Fig. 7.73:<br />

a. Find the currents I and I 6.<br />

b. Find the voltages V 1 and V 5.<br />

c. Find the power delivered to the 6-k� resistor.<br />

E = 28 V<br />

+<br />

V1 –<br />

*11. For the series-parallel network of Fig. 7.74:<br />

a. Find the current I.<br />

b. Find the currents I 3 and I 9.<br />

c. Find the current I 8.<br />

d. Find the voltage V ab.<br />

I<br />

R 1<br />

R2 12 k�<br />

*12. Determine the dc levels for the transistor network of Fig.<br />

7.75 using the fact that V BE � 0.7 V, V E � 2 V, and I C �<br />

I E. That is:<br />

a. Determine I E and I C.<br />

b. Calculate I B.<br />

c. Determine V B and V C.<br />

d. Find V CE and V BC.<br />

R3 12 k�<br />

FIG. 7.73<br />

Problem 10.<br />

R 1<br />

10 �<br />

3 k�<br />

R B<br />

R 4<br />

9 k�<br />

R 5<br />

6 k�<br />

+ V 5 –<br />

I B<br />

I<br />

80 V<br />

R 6<br />

R 2<br />

I 6<br />

10.4 k�<br />

5 � I 3<br />

R 3<br />

FIG. 7.74<br />

Problem 11.<br />

PROBLEMS ⏐⏐⏐ 247<br />

8 �<br />

R7 6 �<br />

R 6<br />

6 �<br />

R 9<br />

R4 = 4 � R5 8 � R8 2 �<br />

220 k�<br />

R C<br />

+<br />

VB B<br />

+<br />

VBE –<br />

VBC –<br />

R E<br />

FIG. 7.75<br />

Problem 12.<br />

I C<br />

2.2 k�<br />

1 k�<br />

I E<br />

I 8<br />

a<br />

V CC = 8 V<br />

C VC +<br />

VCE –<br />

E VE = 2 V<br />

V ab<br />

b<br />

I 9<br />

4 �

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