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Homework Help: Question about using a wheatstone bridge to measure changes in resistance

  1. May 4, 2008 #1

    I need to measure the small changes in resistance of a strain gauge.

    I have read that a wheatstone bridge circuit is used to do this.. but I don't understand why I can't just use a milliammeter to measure the change in current through the strain gauge and then use R=V/I to find the new resistance/change in resistance. Sorry if it's a stupid question, but could someone please explain why a wheatstone bridge is used?

  2. jcsd
  3. May 4, 2008 #2
    From Wikipedia:
  4. May 4, 2008 #3
    so you are saying the only reason to use a wheatstone bridge is to remove the effect of temperature?
    In my experiment, I need to measure how the resistance of a strain gauge varies with changes to the temperature of the specimen material, so does this mean I do not need to use a wheatstone bridge?
  5. May 5, 2008 #4
    anyone? :z
  6. May 5, 2008 #5
    i need help on this one aswell....have u started yet
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