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Unformatted text preview: ENME 350 Electronics and Instrumentation I Fall 2011 Problem 1 [25 pts] Short Answer. Include units! 3. Calculate the voltage VR1. Your answer should be a
number (no variables). KVL “‘0 +VrfZ :O VRl: \lrn : b. Calculate the current IR3 if R3 = R4. Your answer should
be a number (no variables). MoaQ¢73 KCL ‘Z‘l +£z :0 lR3= LEA c. Is element X1 dissipating or supplying power to the
circuit? Circle the correct answer. “a :(~I\)('Z> : Z 2 d. Circle the element(s) in parallel with X1. 10v R1 R2 R3 R4 e. In the circuit below, if an additional resistor is connected
in parallel with R2, will the voltage across R2 increase,
decrease, or stay the same? Circle the correct answer. VRZ increases Ra} in“ 34599, :ﬁmallav— MWWWWWM r, 2mg; VRZ stays the same KVL a"? W2 l. Exam 1 Page 2 of 10 Prof. D. Barker ENME 350 Electronics and Instrumentation I Fall 2011 Problem 2 [25 pts]. Find an algebraic expression for the Vth and Rth, Thevenin equivalent circuit,
in terms of the circuit elements l1, l2, R1, R2, R3, and R4. Write down your intermediate results and simplify your answer (no fractions of fractions). R1 M R2 R4 KCL Q M
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Lﬁt‘pvk ° RH" V‘JA : 1 P3. (TI It Exam 1 Page 3 of 10 Prof. D. Barker ENME 350 Electronics and Instrumentation  Fall 2011 Problem 3 (25 points total) Short Answer —— Circle the correct Answer switch i2 increasey M i2 decreases i; does not change a) 5 pts  What happens to the value of i2 after the switch is closed?
i2 goes to zero Qbid 35:93 5m,“ xv insufficient
information to solve \1‘ :1 lain,th :7 It (Hams5m \ [PSI increases
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P5 decreases b) 5 pts  Let PS be the power delivered by the voltage source. IPSI does not change What happens to after the switch is closed? Ps goes to zero Ca WéaA’KWL w/ M tramwas Insufficient J“ . .
information to solve g=vr Exam 1 Page 5 of 10 Prof. D. Barker ENME 350 Electronics and Instrumentation  Fall 2011 For question 3 (c)(e) use the following figure c) 5 pts  The open circuit voltage, voc,
seen from the terminals a—b is : 4.,
AWL [A1r veg: g '21 C9 d) 5 pts — The Thevenin equivalent resistance, Rt,
seen from the terminals a—b is 11 new Gumtree; mg, 12_0 Q
at 5 ( jﬂ b None of above
M WM Qt: e) 5 pts  Assume that a short circuit (Le, a wire) is connected
between the terminals ab, then the short circuit
current, ishon, going from a to b is . Virk (=9 ,_
have»): —» — = 1 —~ 5
Pm Infinite A None of above Exam 1 Page 6 of 10 Prof. D. Barker ENME 350 Electronics and Instrumentation  Fall 2011 Problem 4 [25 pts]. A battery, which can be modeled by a Thevenin equivalent circuit, has an
open circuit voltage Vbatt. When a load resistor (RL) is connected across the battery terminals,
the output voltage across the battery drops to V0 = 4Vbatt/5. How much power is dissipated in
the Thevenin equivalent resistance of the battery in terms of Vbatg and RL? Write down your
intermediate results and simplify your answer (no fractions of fractions). i”““"‘"‘"’ WW" \Ia\ my ammo; lama“ : :9 
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. l Viki: eh“, Exam 1 Page 7 of 10 Prof. D. Barker ENME 350 Electronics and Instrumentation I Fall 2011 Problem 5 [25 pts]. Find an algebraic expression for the current ix in terms of the circuit
elements Vs, Isl, lsz, and R. Write down your intermediate results and simplify your answer. .. __ _. _ ’  _ VA
“CL 1 I5[ Ly, 0 If“ 1:5” E QUA4 V \\
, , v v 3 v
KLLQW' A 5+L+£X€§W9
R [2
m zvs r2112 Exam 1 Page 9 of 10 Prof. D. Barker ...
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