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

G. Rizzoni, Principles and Applications of Electrical Engineering Problem solutions, Chapter 2with meter incircuitwithout meterin circuita 10.15 mA 9.99 mAb 24.03 mA 23.15 mAc 27.84 mA 26.67 mAd 28.29 mA 27.08 mA________________________________________________________________________Solution:Problem 2.65Known quantities:Schematic of the circuit and geometry of the beam shown in Figure P2.65, characteristics of the material,reads on the bridge.Find:The force applied on the beam.Assumptions:Gage Factor for Strain gauge is 2Analysis:R1 and R2 are in series; R3 and R4 are in series.VSR2VS( R0− ∆R)VS( R0− ∆R)Voltage Division: VR= ==2R + R R + ∆R+ R − ∆R2RVoltage Division:VKVL: − − + 0VRV13240VSR4VS( R0− ∆R)VS( R0+ ∆R)VR= ==4R + R R − ∆R+ R + ∆R2RV2 BA R=40VS( R + ∆R)VS( R0− ∆R)VS2∆RV= VR−VR=−= = VSGFε=4 22R2R2R0000( 2)( )LFwh Y0 S6BA 20002 0.050 V (0.025 m)(0.100m)V wh yF = =V 12L12 V 0.3 m( 12)69×10292BA m =sN19.97 kN.________________________________________________________________________Solution:Problem 2.66Known quantities:Schematic of the circuit and geometry of the beam shown in Figure P2.65, characteristics of the material,reads on the bridge.Find:The force applied on the beam.2.50