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Combine the two parallel combinations circuits

  1. Mar 26, 2007 #1
    1. The problem statement, all variables and given/known data
    [​IMG]


    2. Relevant equations
    V= IR
    P = IV


    3. The attempt at a solution
    Wouldn't you just add 70 and 13 to get 83? if anyone could help it would be greatly appreciated
     
  2. jcsd
  3. Mar 26, 2007 #2

    berkeman

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    Staff: Mentor

    There must be more to the question. Do they give you a current and voltage or something? You can certainly combine the top 4 resistors into a total equivalent resisntance, but that does nothing to constrain R itself. What else are you given?
     
  4. Mar 26, 2007 #3
    I'm sorry, missed that. It says: The equivalent resistance of the circuit in the figure is R eq = 60 ohms: thats all that is given
     
  5. Mar 26, 2007 #4

    SGT

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    As Berkeman said, combine the 4 known resistors into one equivalent resistor. The combination of this with R is 60 ohms.
     
  6. Mar 26, 2007 #5
    so it would be 13 + 13 + 70 + 70?
    = 166
     
  7. Mar 26, 2007 #6

    berkeman

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    Staff: Mentor

    No. First combine each series combinatino of 70+13, then combine the two parallel combinations of those to make one top resistor to substitute for the top 4 resistors. Now what does the overall circuit look like? And how then do you solve for R?
     
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