ELEC 226, Spring 2012
Prof. Rich Kozick

Homework 12 Answers

Please be sure to clearly show your work in the solutions that you submit. Your approach is much more important than obtaining the correct numerical answer.

The answers given below are not complete, but they should be enough for you to check your work.

Problem 5.33: Time constant is 2 s, final capacitor voltage is 8 V.

 

Problem 5.34:  Time constant is 4 s, initial capacitor voltage is 8 V.

 

Problem 5.45:  Time constant is (1/100) s, final inductor current is 0.4 A.

 

Problem 5.46:  Time constant is (1/200) s, initial inductor current is 0.4 A.

 

Problem 5.35:  Maximum capacitor voltage is 17.12 V, there are two time constants that are related by a factor of 2.

 

Problem 5.38:  The current is constant for t >= 0 sec (be sure to explain what is happening!).

 

Problem 5.41: Some key values for v and i are 12 V, 10.67 V, 1.33 V, 3 mA, 2.67 mA, (1/30) sec.

 

Problem 5.56:  An important value of the output voltage is 0.6 V.

 

Problem 5.57:  Do your best on this one! The output voltage is a sum of several terms, where one term is proportional to vi and another term is proportional to the integral of vi.