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Unformatted text preview: ( a ) To do : Will V o be positive or negative when a downward load is added? Solution : V s = supply voltage R 1 R 2 R 4 R 3 V o + − + − Strain gage F Strain gage ( b ) To do : For a loading in which V o = -1.25 mV, calculate the strain ε a in units of microstrain. Solution : ( c ) To do : Calculate the axial stress in the beam under this load. Solution : ( d ) To do : Suppose we want more sensitivity, so we glue another strain gage on top of the beam. Which resistor should we use for this second active strain gage? Solution : ( e ) To do : For the setup of Part (d) with the same strain as in Part (b), calculate output voltage V o . Solution : F Original strain gage New strain gage...
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