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  • Topic: Light, Strain gauge, Wheatstone bridge
  • Pages : 3 (509 words )
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  • Published : February 20, 2011
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Answer to Questions and Problems

1)In a strain gauge bridge, what does (a) a negative reading on the zero centered meters imply? (b) a positive reading on the zero centered meters imply? -A negative reading on the zero centered meter implies that the strain gauge is under compression. Whereas, a positive reading implies that the strain gauge is under tensile / tension.

2)Beside strain gauge transducers, what other transducers can be used in a bridge circuit? -Besides strain gauge transducers, many materials can be used as a makeshift bridge circuit. Materials such as photoelectric which absorbs light and convert the light energy to electrical energy. Etc..

3)Before any strain is applied, the bridge is balanced with R1= 1k, R2= 100, R= 625 and R= 0. Determine the strain if the bridge was rebalanced with R= 2.4. Given: R1= 1kR= 0
R2= 100R= 2.4.
R3= 625 Req’d: Rsf.
Solution:

4)The bridge from the previous problem is balanced this with R1= 3k , R2= 100, R= 1250 and R= 0. Determine the strain if the bridge was rebalanced with R= 6.4. Given: R1= 3kR= 0
R2= 100R= 6.4.
R3= 1250 
Solution:
Rs= (100/3k)(1250)
Rs= 41.67

Rs= (100/3k)(6.4)
Rs= 0.21

Rsf= 41.67 + 0.21
Rsf= 41.88

5)Determine the value of Rx from the balanced bridge shown in the figure below.

Solution:
*From the balance bridge about we can say that:

20(10)=Rx(5)
Rx= 40

Answer to Questions and Problems

1)In a strain gauge bridge, what does (a) a negative reading on the zero centered meters imply? (b) a positive reading on the zero centered meters imply? -A negative reading on the zero centered meter implies that the strain gauge is under compression. Whereas, a positive reading implies that the strain gauge is under tensile / tension.

2)Beside strain gauge transducers, what other transducers can be used in a bridge circuit? -Besides strain gauge transducers, many materials can...
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