ECE-320 CH02.pdf - Unix.eng.ua.edu

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G. Rizzoni, Principles and Applications of Electrical Engineering Problem solutions, Chapter 2We can construct the following table:x I Rx (Approx.)1 10 -2 A 3 Ω2 10 -1 A 0.3 Ω3 10 0 A 0.03 Ω________________________________________________________________________Solution:Problem 2.60Known quantities:Schematic of the circuit shown in Figure P2.60; for part b: value ofammeter.Find:The current i; the internal resistance of the meter.Assumptions:Analysis:r a
G. Rizzoni, Principles and Applications of Electrical Engineering Problem solutions, Chapter 2Find:The internal resistance of the voltmeter.Analysis:Using the voltage divider rule:r+ RmV = 11.81 = (12)rmsTherefore, rm= 1.55 MΩ.________________________________________________________________________Solution:Problem 2.62Known quantities:Circuit shown in Figure P2.61 with source voltage,Find:The meter reads in the various cases.Analysis:By voltage division:rmV = (24)r + RmsV s= 24V; and ratios between Rsand rm.Rs0.2 r m0.4 r m0.6 r m1.2 r m4 r m6 r m10 rmV20 V17.14 V15 V10.91 V4.8 V3.43 V2.18 VFor a voltmeter, we always desire rm>> Rs .________________________________________________________________________Solution:Problem 2.63Known quantities:Schematic of the circuit shown in Figure P2.63, values of the components.Find:The voltage across R4with and without the voltmeter for the following values:2.47
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ECE-320 CH02.pdf - Unix.eng.ua.edu

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