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ECE35_Practice_Final

# ECE35_Practice_Final - University of California San Diego...

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University of California San Diego Department of Electrical and Computer Engineering ECE 35 Final Exam Winter 2009 Signature ______________________________ Name (Last, First) ______________________ Student ID Number ______________________ This is a closed book exam, but you are allowed a single 8.5” x 11” page sheet of notes. You can use a non-graphing calculator, but cellphones and computers are forbidden. Write clearly: work which is not legible will not count towards your grade. Numeric answers MUST HAVE UNITS to be correct (i.e., 3 Ω , 2A, 4mV) You must show your work to receive credit on any problem. Good exam policy: - ASK FOR CLARIFICATION IF THE QUESTION ASKED IS NOT CLEAR - READ THROUGH THE ENTIRE EXAM BEFORE BEGINNING - WORK ON THE SIMPLER PROBLEMS FIRST - TRY TO ANSWER ALL PROBLEMS Grade Key 1 _________ / 10 2 _________ / 20 3 _________ / 20 4 _________ / 20 5 _________ / 20 6 _________ / 20 7 _________ / 20 8 _________ / 20 _________________ _________ / 150

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Problem 1 (10 pts): A) Graph the voltage as a function of time if v(t) = 2 + 2cos(4 π t + π /4) [ v(t) is in Volts, t is in seconds ] (be sure to label and scale the axes) B) Either represent v(t) as a phasor in angle notation, or briefly explain why it can not be represented that way.
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