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Homework Help: Working out internal resistance.

  1. Nov 8, 2006 #1
    I have two different circuits and I need to work out the internal resistance of the cell.

    So far I have got to 0.8(5+r)=1.2(2.5+r)

    Where do I go from here?
  2. jcsd
  3. Nov 8, 2006 #2
    Assuming the equation you have is correct, it should be relatively simple to solve. I suppose the simplest way to get you started is to suggest using the distributive property on both sides of your equation in order to "clean it up."
  4. Nov 8, 2006 #3


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    he means multiply out yer brackets ;)
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