Ee215-w06-examfs - EE215 Fundamentals of Electrical Engineering Final Exam Time in class 110 minutes Class_EE215 Section Name Student ID Please

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EE215: Fundamentals of Electrical Engineering Final Exam March 13, 2006 Time: in class, 110 minutes Class: _ EE215 _____________ Section: ____________________ Name: ____________________ Student ID: ____________________ Please show all steps in solving the problems. Clearly mark your final answers and don’t forget the units. Problem 0 (4 points) Please mark all correct answers! (a) The Professor’s last name is: ± Bohringer ± Böhringer ± Bröhringer (b) What is the name of your TA? ________________________ (c) Which component(s) were covered in class and labs? ± Resistors ± Capacitors ± Inductors ± Switches ± Bipolar Transistors ± Potentiometers ± Transformers Answer: (a) Böhringer. (b) Carl Thomas, Eric Tran, or Xiaolong Yu. (c) We discussed resistor, capacitors, inductors, and switches in class and bipolar transistors and potentiometers in the lab. We did not cover transformers.
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Problem 1 (12+6 = 18 points, brought to you by Carl Thomas) (a) In the circuit shown above, find the equivalent resistance between nodes a and b, R ab . (b) Find the Thévenin equivalent circuit ( V Th , R Th ) with respect to nodes a and b. Answer: (this is similar to Problem 3.58) (a) First add the series resistors: 28k Ω + 22k Ω = 50k Ω . 1k Ω + 1k Ω = 2k Ω . (2 pts) Now we have a delta configuration with R a =40k Ω , R b =50k Ω , R c =10k Ω . (1 pts) Use delta-wye transform to get R 1 =4k Ω , R 2 =3k Ω , R 3 =20k Ω . (6 pts) Then we can calculate R ab = 1.5k Ω + 20k Ω + (4k Ω +3k Ω )||(5k Ω +2k Ω ) = 21.5k Ω + 3.5k Ω = 25k Ω . (3 pts) (12 pts total) (b) R Th = R ab = 25k Ω . (3 pts) V Th = R ab i = 25k Ω 3mA = 75V. (3 pts) (6 pts total) 1.5k Ω 28k Ω 40k Ω 3k Ω 22k Ω 1k Ω 10k Ω 1k Ω b a 3mA 1.5k Ω 40k Ω 3k Ω 10k Ω b a 3mA 50k Ω 2k Ω 1.5k Ω 3k Ω 4k Ω b a 3mA 20k Ω 2k Ω 5k Ω
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Problem 2 (5+9+7+6 = 27 points, brought to you by Xiaolong Yu) In the circuit above, suppose that 0 = g i for 0 < t and A e
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This note was uploaded on 03/29/2012 for the course EE 215 taught by Professor Unknown during the Spring '05 term at University of Washington.

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Ee215-w06-examfs - EE215 Fundamentals of Electrical Engineering Final Exam Time in class 110 minutes Class_EE215 Section Name Student ID Please

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