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Resistor Bridge

  1. Apr 26, 2009 #1

    x^2

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    1. The problem statement, all variables and given/known data
    What current flows through resistor R1 (350 Ohms) in the figure when the applied voltage is 50 V?
    prob03a_circ_comp_resis.gif

    2. Relevant equations

    V = IR ?

    3. The attempt at a solution

    I would have thought the answer would be zero because I thought the potential at R1 is equal (but this was incorrect). What am I missing here? I guess I don't see how the potential at this point isn't equal, and I'm not sure how to solve it now knowing that it must not be the same.

    x^2
     
    Last edited: Apr 26, 2009
  2. jcsd
  3. Apr 26, 2009 #2

    LowlyPion

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    Homework Helper

    If the other R's are equal, then it is 0.

    With 50V applied to AB, the terminals of each side of R1 would be 25V. No net voltage, no current.
     
  4. Apr 26, 2009 #3

    x^2

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    That's what I thought..... I tried 0 A but it was incorrect. I'm going to talk to the prof. and see what is wrong.

    Thanks!
    x^2
     
  5. Apr 26, 2009 #4

    x^2

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    The correct answer is 0 A. There was a problem with the system which was why I was getting it wrong.

    Thanks for the confirmation!
    x^2
     
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