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Homework Help: Equivalent Resistance Problem

  1. May 5, 2012 #1
    I don't understand how I comes into play in the four equations.
    For example, in V = (I + I1)R, shouldn't it just be
    V = I1R?
    Or V = (I(component through bottom wire) + I1)R?

    Any help would be greatly appreciated. Thanks!

    Attached Files:

  2. jcsd
  3. May 5, 2012 #2


    User Avatar

    Staff: Mentor

    Imagine that there's another loop involved, one that is supplying the voltage V and current I at the given nodes:


    I think you'll see where the "I" is coming from.

    Attached Files:

  4. May 5, 2012 #3
    Thank you very much! But isn't the I split between the three branches instead of going entirely through the bottom one? Thanks again!
  5. May 5, 2012 #4
    Oh I get it - thank you! :)
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