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Unformatted text preview: Color: ﬂ/ORY University of Arizona
Department of Electrical & Computer Engineering ECE 220 Basic Circuits Examination 1 VFebruary 14, 2003 V Closed book/notes, calculators allowed. Part I: 8 questions Part II: 8 questions.
Part II is worth twice as much as Part I. On the SCANTRON write and bubblein your: 1. Name (Last, ﬁrst)
2. 13 digit ID number which is given on your exam paper. (Remember this ID for
future exams.) Write this leftjustiﬁed under columns AC under IDENTIFICATION NUMBER.
Write the color of your exam paper (IVORY or GREEN) on the top left margin of the SCANTRON. DJ Place your UA picture ID card on the adjacent desk where it can be easily seen. When the 9:00 bell rings, begin the examination. All work should be done on the examination
paper. Allow for reasonable amounts of roundoff error, and carefully mark one choice for each problem on the SCANTRON answer sheet.
A B C D E
e.g. 1 (D @ . ® ® ifthe answer for Question 1 is C. All answer sheets and examinations will be collected at or before 9:55. You will be asked to stop
writing and hand in your papers/answer sheets. Failure to comply promptly may result in disqualiﬁcation from the exam. Remember this number: NAME: SIGNATURE: It will be used to post your
ECE 220 grades throughout the
semester. Part I. 10 mins I, A 3300 pF capacitor can also be speciﬁed as: (a) 0.33 pF (b) 33x109fF
(c) 3.3 nF (d) 33 nF (6) None of these 2 . All resistors shown have value 3 Q. The equivalent resistance seen at terminals {a,b} is: (a) 5 Q a
(b) 4.5 Q (c) 9 Q (d) 6 Q (e) None of these 3. How much power is the element absorbing? 3A
_ .4:—
(a) ~27 W
(b) 27 W
(c) 3 W 9V
(d) 3 W
(e) None of these +
4’. The value of voltage v is: +
(a) 8 V 16 kQ
(b) 6 V v 12 V
(c) 4 V 8 k9
(d) 16 V  (6) None of these 5 The value ofthe current i0 is: 1:,
(a) 20A 0'55 4——
(b) 5A ———W\/V—
(c) 20A + 10V  (d) 5 A
(e) None ofthese Part I. 10 mins (cani'rleL) b  The power dissipated in the 9 k0 resistor is: 9 k9
(a) 81 mW
(b) 9 mW
(c) 900 mW
(d) 100 mW
(e) None of these 6
1 k9 '7; . Kyle is in a potentially dangerous predicament. Which one of the following values of R will save him
from electrocution? (a) 2 D
(b) 5 Q R
(c) 0.80
(d) 1.25 O 500 kV
1 Q g What is the value of V0 ? 4k§2 (a) 10 V
(b) 22 V
(c) 14 V
(d) 10 V
(e) None of these Part II. 40 mins q. After the switch is closed, the current is given by:
i(t) = 2e—0‘“ A How much energy is absorbed by the circuit element during the ﬁrst 5 seconds after the switch is closed?
(a) 47.22 J
(b) 56.78]
(c) 32'5J Circuit
(d) 18.58 J element (e) None of these I 0 c Find the power delivered by the 10 mA current source. (a) 50 11W
(b) 75 pW
(c) 100 “W
(d) 150 “W
(e) None of these 0.25 v0 10 mA i I Find the power dissipated in the 60ohm resistor. (a) 45 W
(b) 15 W
(c) 3 W
(d) 9 W
(e) None ofthese 409 101 209 i 600 100v 90 f2 '2 . Find the value ofthe current i. (a) 2 A (b) 4 A (c) 4.5 A (d) 8A (e) None of these 120V SQ 6Q 3Q I 3‘ Find the value of the voltage v0. (a) 2.4V
(b) 3.6V
(c) 5.2V
(d) 1.6V
(6) None ofthese 300 mA 29 4Q I 9' Find Rab. (All resistances shown are in ohms.) (a) 8 0 (b) 160 4
(c) 11 Q a (d) 13.2 Q (6) None of these 10 2.6 [6 Find the voltage v0. (a) UV
(b) 9V
(c) 6V
(d) 3V
(6) None ofthese 16. (a)
(b)
(C)
(d)
(6) This meter has been designed to: measure currents of 01 A measure currents of 010 A measure voltages of 0—1 V measure voltages of 010 V None of these functions make sense for this meter l: ...
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 Spring '08
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