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Equivalent Resistance/ resistors in series and parallel

  1. Sep 16, 2012 #1
    1. The problem statement, all variables and given/known data
    Find R_AB in the network. Look at attached file "Problem"


    2. Relevant equations
    R_S= R1+R2+R3+....Rn (for series resistors)
    1/RP= 1/R1 + 1/R2 + 1/R3 + 1/Rn.... (for parallel resistors)
    V=IR (ohm's law)


    3. The attempt at a solution
    Look at attached file "Problem Attempt"

    I know I'm probably not looking at these circuits the correct way, because each time I try to solve these problems, I find different equivalent resistances depending on the order by which I use the series resistor and parallel resistor formula. I really want to know the correct way to read the diagram, because that is half the battle, and it would guide my calculations a lot more smoothly.

    I'm also stuck. What do I do with that 9ohms?
     

    Attached Files:

    Last edited: Sep 16, 2012
  2. jcsd
  3. Sep 16, 2012 #2
    4 ohm and 14 ohm resistors should be in series. Redraw your sketch.
     
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