Page 71 - Schaum's Outline of Theory and Problems of Electric Circuits

ANALYSIS METHODS
[CHAP. 4
60
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4.30 In the network shown in Fig. 4-43 the two current sources provide I and I 00 where I þ I ¼ I. Use
superposition to obtain these currents. Ans. 1.2 A, 15.0 A, 16.2 A

Fig. 4-43

4.31 Obtain the current I in the network shown in Fig. 4.44. Ans: 12 A

Fig. 4-44

Fig. 4-45

4.32 Obtain the The ´ venin and Norton equivalents for the network shown in Fig. 4.45.
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Ans: V ¼ 30 V; I ¼ 5A; R ¼ 6
4.33 Find the maximum power that the active network to the left of terminals ab can deliver to the adjustable
resistor R in Fig. 4-46. Ans. 8.44 W

Fig. 4-46
4.34 Under no-load condition a dc generator has a terminal voltage of 120 V. When delivering its rated current
of 40 A, the terminal voltage drops to 112 V. Find the The ´ venin and Norton equivalents.
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Ans: V ¼ 120 V; I ¼ 600 A; R ¼ 0:2
4.35 The network of Problem 4.14 has been redrawn in Fig. 4-47 and terminals a and b added. Reduce the
network to the left of terminals ab by a The ´ venin or Norton equivalent circuit and solve for the current I.
Ans: 8:77 A