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846 ⏐⏐⏐ NETWORK THEOREMS (ac)<br />

I = 4 mA ∠ 0°<br />

E = 20 V ∠ 0°<br />

+<br />

E = 2 V ∠ 0° R 1 k� C 3.98 nF<br />

–<br />

FIG. 18.133<br />

Problem 47.<br />

+<br />

–<br />

f = 10 kHz<br />

R 1 4 k� R 2 8 k�<br />

R 1<br />

4 k�<br />

1 k�<br />

R 2<br />

I<br />

a<br />

b<br />

6 k�<br />

R3 R5 R4 11 k�<br />

L<br />

31.8 mH<br />

FIG. 18.132<br />

Problem 46.<br />

Th<br />

*46. a. For the network of Fig. 18.132, determine the level of<br />

capacitance that will ensure maximum power to the<br />

load if the range of capacitance is limited to 1 nF to<br />

5nF.<br />

b. Using the results of part (a), determine the value of R L<br />

that will ensure maximum power to the load.<br />

c. Using the results of parts (a) and (b), determine the<br />

maximum power to the load.<br />

LOAD<br />

R L<br />

C (1 – 5 nF)<br />

SECTION 18.6 Substitution, Reciprocity, and<br />

Millman’s Theorems<br />

47. For the network of Fig. 18.133, determine two equivalent<br />

branches through the substitution theorem for the branch<br />

a-b.<br />

R 1<br />

1 k�<br />

8 k�<br />

8 k�<br />

(a) (b)<br />

FIG. 18.134<br />

Problem 48.<br />

48. a. For the network of Fig. 18.134(a), find the current I.<br />

b. Repeat part (a) for the network of Fig. 18.134(b).<br />

c. Do the results of parts (a) and (b) compare?<br />

I<br />

4 k�<br />

R 2<br />

–<br />

R 3<br />

R 4<br />

11 k�<br />

E = 20 V ∠ 0°<br />

+<br />

R 5 = 6 k�

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