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Total resistance

  1. Dec 11, 2007 #1
    1. The problem statement, all variables and given/known data

    https://www.physicsforums.com/attachment.php?attachmentid=11955&stc=1&d=1197437955

    Find the equivalent resistance between points A and B shown in the link above

    2. Relevant equations

    for parallel, equivalent resistance is =1/R1 +1/R2 +1/R3.....
    equivavalent resistance for series is = R1 + R2 + R3

    3. The attempt at a solution

    i belive they are all parallel or R3, R4, R5, and R6 are series becouse they depend on each other
     

    Attached Files:

  2. jcsd
  3. Dec 12, 2007 #2
    1/R= 1/1.5 + 1/2.5 + 1/4.3 +1/3.3 + 1/8.1 +1/6.3 =1.88
    r=.53 ohm. this is not correct. the back of my book says .838 and can someone tell me how they got that answer
     
  4. Dec 12, 2007 #3

    marcusl

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    Gold Member

    First find the parallel resistance of R3, R4 and R5, call it maybe R'. Now you see that R1, R2 and the series combination (R'+R6) are in parallel. That will give you the answer.
     
  5. May 25, 2009 #4
    when can you say that the voltage in the loop will be zero? not in this case?
     
  6. May 25, 2009 #5

    Redbelly98

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    The voltage around any loop is zero, but that is not needed here. This problem can be solved using series and parallel rules for combining resistors.
     
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