Example 7.11 Analyzing an RL Circuit that has Sequential Switching The two switches in the circuit shown in Fig. 7.31 have been closed for a long time. At t = 0, switch 1 is opened. Then, 35 ms later, switch 2 is opened. %3D 60 V a) Find iz(1) for 0SIS 35 ms. b) Find i for t 2 35 ms. c) What percentage of the initial energy stored in the 150 mH inductor is dissipated in the 18 n resistor? Figure 7.32 A d) Repeat (c) for the 3 N resistor. e) Repeat (c) for the 6 2 resistor. 1= 35 ms Figure 7.33 A 60 V 12 n $6n 03I50 mH 18N b) When = current is Figure 7.31 A The circuit for Example 7.11. Thus, whe
Example 7.11 Analyzing an RL Circuit that has Sequential Switching The two switches in the circuit shown in Fig. 7.31 have been closed for a long time. At t = 0, switch 1 is opened. Then, 35 ms later, switch 2 is opened. %3D 60 V a) Find iz(1) for 0SIS 35 ms. b) Find i for t 2 35 ms. c) What percentage of the initial energy stored in the 150 mH inductor is dissipated in the 18 n resistor? Figure 7.32 A d) Repeat (c) for the 3 N resistor. e) Repeat (c) for the 6 2 resistor. 1= 35 ms Figure 7.33 A 60 V 12 n $6n 03I50 mH 18N b) When = current is Figure 7.31 A The circuit for Example 7.11. Thus, whe
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Transcribed Image Text:Example 7.11 Analyzing an RL Circuit that has Sequential Switching
The two switches in the circuit shown in Fig. 7.31
have been closed for a long time. At t = 0, switch 1
is opened. Then, 35 ms later, switch 2 is opened.
a) Find i (1) for 0 sI 35 ms.
b) Find i for t 2 35 ms.
%3D
60 V
c) What percentage of the initial energy stored in
the 150 mH inductor is dissipated in the 18 2
resistor?
Figure 7.32 A TH
d) Repeat (c) for the 3 Q resistor.
e) Repeat (c) for the 6 2 resistor.
1= 35 ms
Figure 7.33 A The
40
3 0
60 V 12n 36n 03I50 mH 18 N
b) When t = 3
current is
iL
Figure 7.31 A The circuit for Example 7.11.
توررک
Thus, when
reduces to th-
time constan
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