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Homework Help: Wheatstone Bridge Question

  1. Apr 3, 2010 #1
    1. The problem statement, all variables and given/known data

    Suppose that in the course of a measurement the bridge is balanced and then the power supply voltage changes by 10%, what will happen to the balance of the bridge? Explain.

    2. Relevant equations

    No equations.

    3. The attempt at a solution

    When I think it out logically, I don't think the balance should be affected. Because if the voltage increases, the values of the resistances will still be balanced. Is this wrong?

    But then I think if the voltage increases, you have to balance the bridge out again.
     
  2. jcsd
  3. Apr 3, 2010 #2
    What is the condition for the four resistances to make a wheatstone bridge balanced? Does the supply voltage come into it?
     
  4. Apr 3, 2010 #3
    R1/R2 = R3/R4

    i don't think these values would change if the voltage changes 10% during the measurements.
     
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