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ECE35_Practice_Midterm

ECE35_Practice_Midterm - University of California San Diego...

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University of California San Diego Department of Electrical and Computer Engineering ECE 35 Midterm 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 calculator, but cellphones and computers are absolutely forbidden. You must show your work to receive credit on any problem. 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) Good exam policy: (1) READ THROUGH THE ENTIRE EXAM BEFORE BEGINNING (2) WORK ON THE SIMPLER PROBLEMS FIRST (3) TRY TO ANSWER ALL PROBLEMS Grade 1 _________ / 20 2 _________ / 20 3 _________ / 20 4 _________ / 20 5 _________ / 20 __________________ _________ / 100
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Problem 1 (20 pts, 5 points each): R 1 R 2 A B 2R x A B R x I s A) Calculate the power absorbed by each element in the drive circuit below when terminals A and B are unconnected. P (I s ) = ___________ P (R 1 ) = ____________ P (R 2 ) = ____________ B) Express the Thevenin equivalent voltage and resistance, and Norton equivalent current, to the drive circuit at left V th = ___________ R th = ____________ I n
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