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Unformatted text preview: ECE 2300 CIRCUIT ANALYSIS HOMEWORK #3 1. a) Find the power delivered by the source in this circuit. b) Find the voltage v X . +- v S = 9[V] R 1 = 1[k ] R 2 = 2.7[k ] R 3 = 1.5[k ] R 5 = 3.3[k ] R 4 = 5.6[k ] R 6 = 2.2[k ] +- v X (PWA Problem 1 in Module 2) 2. A voltmeter is used in series with a resistor to obtain a new voltmeter with the ability to read a higher voltage. The combination is given in the circuit here. The original voltmeter has a meter resistance of 10[k ], and reads up to 2[V] full-scale. a) The goal is to have a new voltmeter that can read up to 50[V]. What value of resistor R V should be used to make this happen? b) When 18[V] is applied to this series combination, with R V as found in part a), what will the original voltmeter read on the 2[V] scale? (PWA Problem 7 in Module 2) Next slide Voltmeter R V v T +- v M +- B A V 3. A measurement of an unknown resistor R X is attempted using a voltmeter and an ammeter, as shown in the circuit here. The intention is to simultaneously measure the current through the resistor with the ammeter, and the voltage across the resistor with the voltmeter. The resistance will then be obtained from the ratio of these two readings. For this problem, assume that the meter resistance for the ammeter is 100[ ], and for the voltmeter is 10[k ]. a) Find the ammeter reading, if R X is 2.7[k ]. b) Find the voltmeter reading, if R X is 2.7[k ]. c) Find the ratio of the voltmeter reading to the ammeter reading. d) How much error is there in this resistance measurement? e) What resistance is this technique really measuring? (PWA Problem 8 in Module 2) 4. A voltmeter has a full-scale reading of 5[V], and a resistance of 50[k ]. Consider each of the following cases, one at a time, for the circuit shown below. a) Find the magnitude of the voltage read by this voltmeter, if it is placed between terminals a and c....
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This note was uploaded on 09/04/2011 for the course ECE 2300 taught by Professor Staff during the Spring '08 term at University of Houston.
- Spring '08