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Unformatted text preview: Purdue University, School of Electrical and Computer Engineering Prof. DeCarlo ECE 202 L INEAR C IRCUIT A NALYSIS II (S P 10) Homework #6 Solution (2124) Problem 21 R s = 2 , R L = 8 , R 1 = 190 , L = 20H v in ( t ) = 100 [V] for all time. When the switch has been in position A for a long time (left figure), the current through the inductor is v in / ( R s + R L ) = 10 [A] which is the initial condition for the inductor for t 0. So, i L ( ) = 10 [A]. For t 0, the equivalent sdomain circuit accounting for the initial condition is shown on the right. I 1 = V in ( s )+ Li L ( ) R s + R 1 + R L + Ls = 10 s + 5 s ( s + 10 ) V out ( s ) = R 1 I 1 = 190 10 s + 5 s ( s + 10 ) v out ( t ) = 95 ( 1 + 19 e 10 t ) u ( t ) [V] p R 1 ( t ) = i 1 ( t ) v out ( t ) = v 2 out / R 1 = 95 2 19 e 10 t + 1 2 [W] E diss = Z t p R 1 ( ) d = 47 . 5 t 180 . 5 e 10 t 857 . 4 e 20 t + 1038 [J] 1/ 5 Purdue University, School of Electrical and Computer Engineering...
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This document was uploaded on 04/02/2010.
 Spring '06

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