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Exam 2 Fall - EE 214 Exam#2 Fall 2006 Instructions This is...

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Unformatted text preview: EE 214 Exam #2 Fall 2006 Instructions: This is a closed book, closed notes test. Show all work ' on all problems. For credit you must use the method specified. Place answer in the space provided. Name Sojufibfi/ ID# 1) For the ideal op amp shown, find the output current Io. (15 points) ’OK 4‘ Io= ' l M" amps 9‘5““ 4 Va 7... 0 s) V° .2: ~05,» :7 V5" m,” - 10M, roK 2) For the ideal op amp shown, find the value of'R'r that will make V0 =- 8 yolts. ‘(20 points) R Rf: - 9'0 K ohms ‘ I”, O 5' v w: a 0; —-. X (#13665 + LF- ‘0) - l“ + [2514 5K (9 W + V»: --\/o .. O r ’0“ P151 3) If the switch is opened in this circuit at t=0, find an expression for _ i(t). (15 points) 3.00 (K .. ”our? 30;): 5’33 e «if! 4) For the circuit shown, the switch has been in position “a” for a long time and is moved from position “a" to position “b” at t=0. Find the expression for i(t) for tzO. (15 points) 33K ' ‘. 6 ark .. 30" 5) The switch in the circuit shown has been closed for a long time. It is opened at t=0 and then closed back at 3 time constants. Find an expression for i(t) for tzo. Sketch the waveform of i(t) for all time. (20 points) , t: a fiat): {0+ (awnwjicw‘ ,2 meal; a 6) In the circuit shown, the switch is opened at t=0. (a) Find the value of the current i(t) after the switch has been open for a long time. (5 points) (b) How long will it take after the switch is opened for the current to effectively reach (within 1%) its final value (10 points) ~ (a) i(t)= Lamps (b) t: ' 4 W , seconds v7.4.1: ~2~3e $7 4.9/3.4»? 1% 2‘ :4) t: l- 0""le ...
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