1. EE211 Quizzes Spring 2000 Instructor: Dr. K.D. Donohue

2. Quiz 2 Find the Voltage V s and Current I s in the circuit below if each 8  load is absorbing 2 W. VsVs IsIs 88 88

3. Quiz 3 Determine I L in the circuit below: IxIx ILIL 24 mA 8k  16k  2Ix2Ix

4. Quiz 4 a) (2 points) Simplify circuit to find V s, b) (1 point) then expand to find I 1. (SHOW YOUR WORK CLEARLY) 24 mA 20 k  8 k  4 k  I1I1 +Vs-+Vs-

5. Quiz 5 A) (1.5 points) Find V x by nodal analysis. B) (1.5 points) Find I x by loop analysis. 12 V 10  66 22 33 + V x - IxIx

6. 60 k  20 k  30 k  2V 3V +Vo-+Vo- Quiz 6 Find V o in the circuit below. (Show clearly how you obtained this result for full credit!)

7. Quiz 7 Use Thevénin’s theorem to find V 0 in the Circuit below: 2  + V x - +Vo-+Vo- 4  2  6  3V x 3 A

8. Quiz 7.5 (Take Home) This is due Tuesday March 7, 2000 at the beginning of the class period. All students are to work independently on this. There is to be NO COLLABORATION on this work. Any detected cheating will result in an E for the course for all involved parties. You are free to use any book, notes, or computer program to solve this. If you get a result from a computer, please indicate the program used to obtain the result. Otherwise all work to obtain the result should be clearly shown. A.Derive a set of equations that completely describe all node voltages or loop currents in the circuit below (1.5 points). B.Use the set of equations to find V o (0.5 points). C.Simulate the circuit in SPICE and determine V o (submit printout of SPICE schematic with meter reading) (1.0 points). 100  55 20  10k  20  44 40  55 10I x IxIx +Vx-+Vx- 2Vx2Vx +Vo-+Vo- 8V 10 

9. Quiz 8 Find a circuit that will effectively integrate the voltage v i (t) when connect to the terminals AB. Specify resistors, capacitors, and inductors, and initial conditions such that the relationship between the input and output (v o (t)) is given by: vi(t)vi(t) 1 k  A B

10. Quiz 9 A)Use differential equation approach to find i L for t > 0 (2.6 points) B)Determine the time constant for this circuit for t > 0 (0.4) points 15 A 75  3H iLiL

11. Quiz 10 Determine equation for v o (t) for t > 0, when subjected to input pulse shown in figure. 10k  v s (t) vs(t)vs(t) 10k  5k .05mF +vo(t)-+vo(t)-

12. Quiz 11 Find the equation for i(t), t > 0 10 V t = 0 0.46mF 10  0.1H

13. Quiz 12 (Take Home) (a) Use SPICE to plot i o (t) for t > 0. The time axis should be long enough to show current has reached an effective steady- state. (2 points) (b) Find complete solution for i o (t) for t > 0 analytically. (1 point) 5[u(t)-u(t-0.5)] V io(t)io(t) 0.1mF 1k  2H 1k 

14. Quiz 13 Find the equivalent impedance Z eq for the circuit below, if the source driving it has a radian frequency (  ) is 100 rads/sec: Z eq  0.25 mF 30  0.2H 0.5 mF 20 

15. Quiz 14 (Not for Credit) Find the steady-state response for v o (t), when  =10k radians/s: 1 k  10 k  0.1 H 0.1  F +vo(t)-+vo(t)- ANS: