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The current, Potential Difference, in a 3-cell circuit

  1. May 1, 2015 #1
    1. The problem statement, all variables and given/known data
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    2. Relevant equations


    3. The attempt at a solution
    I've never dealt with a three-cell circuit before. For calculating the current, I tried doing Kirschoff's Voltage Law, all I kept getting was that I1 = negative I2. I tried taking the current as coming out of the 2 voltage cell, but now i'm starting to doubt myself. However, taking it from the other cells doesn't seem to do anything else. I'm not quite sure how to solve b, or c without a. Any help? Thanks!
     

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  3. May 1, 2015 #2
    WE are doing this in school currently and I don't know if you know this or not, but everything is a variation of V=IR except when adding current and resistance in series/parallel. What i find that helps in this situation is to go through it step by step to figure out whats series and parallel and adding them together step by step.
     
  4. May 1, 2015 #3
    I'm not quite sure how I can add anything if a cell is present. Do I add it normally or do I have to include the cell somehow?
     
  5. May 1, 2015 #4

    haruspex

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    Please post your attempts, it's not enough to describe them.
     
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