practice-final

15 pts 5 ma name 10 k 5 k v0 5 k 30 v i

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Unformatted text preview: rcuits Spring 2012 Exam I 1. (15 pts) 5 mA Name: 10 k + 5 k V0 - 5 k + - 30 V (i) Using the principle of superposition, determine the contribution of the current source to V0 a) 12.5 Volts b) 75 Volts c) 10 Volts d) 25 Volts e) 2.5 Volts (ii) Determine the contribution of the voltage source to V0 . a) 24 Volts b) 15 Volts c) 10 Volts d) 3 Volts e) 6 Volts 60 F 60 F 120 F 120 F Ceq (iii) What is the equivalent capacitance for the combination shown? a) 20 F b) 180 F c) 270 F d) 144 F e) 40 F Page 1 of 7 059:008 Electrical Circuits Spring 2012 Exam I 2. (15 pts) 20 V iC(t) 60 F Name: vC(t) + vC(t) 10 V 2s 4s 6s 8s t (s) -10 V -20 V - (i) For the capacitor and voltage waveform shown, what is iC (t) at t = 7 s? a) -6 mA b) -0.6 mA c) 3 mA d) 0.3 mA e) 0.6 mA (ii) Over what time interval is the capacitor supplying power? a) 0 s 2 s b) 2 s 6 s c) 6 s 8 s d) 0 s 8 s e) The capacitor never supplies power (iii) Over what time interval is the capacitor storing energy? a) 0 s 2 s b) 2 s 6 s c) 6 s 8 s d) 0 s 8 s e) The capacitor cannot store energy Page 2 of 7 059:008 Electrical Circuits Spring 2012 Exam I 6....
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This document was uploaded on 03/13/2014 for the course ENGINEERIN 31 at University of Iowa.

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