Unformatted text preview: 1 EE2120 TEST No. 3.V1 December 4, 2002 NAME(please print)
SSN
INSTRUCTIONS
Failure to follow these instructions may result in your work NOT being accepted for credit. • DO NOT OPEN THIS TEST UNTIL THE INSTRUCTOR
TELLS YOU
• All work is individual. Concentrate on your own paper at all times
• STOP WORKING AS SOON AS THE INSTRUCTOR TELLS
YOU
• When instructed, walk to the front and leave your work on the instructor’s desk
• If you ﬁnish ahead of time, walk to the front and leave your work on the
instructor’s desk
• SHOW ALL YOUR WORK Prepared by Dr. Jorge L. Aravena. Last revised on December 4, 2002 2 1. (25pts) For the circuit in the ﬁgure use R1 = 4kΩ, R2 = 3k Ω, R3 = 6kΩ, RL = 10k Ω
(a) (15pts) Use Thevenin to determine the current IO .
(b) (5pts) What value of RL would maximize the power transfer?
(c) (5pts) For the value of RL computed in part (1b) determine the power transferred to
the load resistance RL . R2 4mA 12V +
− R1 IO
RL R3 Prepared by Dr. Jorge L. Aravena. Last revised on December 4, 2002 3 2. (25pts) For the circuit in the ﬁgure, R1 = R2 = R3 = 4kΩ, R4 = 3kΩ, a = 2.
(a) (20pts) Determine the Thevenin equivalent circuit at terminals a − b (b) (10pts) If an external resistor Rab = 5k Ω is connected between terminals a − b determine
the power absorbed by the resistor Rab . 12V R1
aVx − R2 + − + R4 +
Vx
− a R3 b Prepared by Dr. Jorge L. Aravena. Last revised on December 4, 2002 4 3. (25pts) For the circuit in the ﬁgure
(a) (15pts)determine the power transferred to the load RL as function of the parameter a.
(b) (10pts)Determine the value of a to insure maximum power transfer to the load RL .
Hint: Use Thevenin theorem aVX 9V + 2kΩ
− +
VX
− RL Prepared by Dr. Jorge L. Aravena. Last revised on December 4, 2002
4. (30pts) For the circuit in the ﬁgure,L = 10mH, C = 100µF , v (t) = cos103 t. If iL (0) = 0. vt
() +
− L C Determine
(a) The current through the capacitor for t > 0
(b) The current through the inductor for t > 0
(c) The total energy stored in the circuit (INDUCTOR PLUS CAPACITOR)for t > 0
(d) The instantaneous power supplied to the capacitor for t > 0
(e) The instantaneous power supplied to the inductor for t > 0
(f) The current supplied by the source for t > 0 5 ...
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 Fall '08
 ARAVENA
 Energy, Resistor, Jaguar Racing, Thévenin's theorem, Jorge L. Aravena, Dr. Jorge L. Aravena

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