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Circuit diagram question

  1. May 20, 2015 #1
    1. The problem statement, all variables and given/known data
    I am trying to find the current across Rg. I do not understand the answer provided

    2. Relevant equations


    3. The attempt at a solution
    Am I supposed to add the two voltage sources and then continue?
     

    Attached Files:

  2. jcsd
  3. May 20, 2015 #2
    No, you can't simply add them at this point. You'll need to write loop equations.
     
  4. May 20, 2015 #3

    CWatters

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    I can't read the writing on the circuit but it might be symmetrical left to right. If it is that may simplify things.
     
  5. May 20, 2015 #4
    yes it is symmetric
     
  6. May 20, 2015 #5

    CWatters

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    In that case you can simplify the circuit. Remember that nodes that are the same voltage can be connected together with a wire without affecting it in any way. Try that. Meanwhile I'll check the given answer is correct.
     
  7. May 20, 2015 #6

    CWatters

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    I agree with the given answer.

    No need to write loop equations to get that answer.

    If you get stuck let us know but see the hint in the previous post.
     
  8. May 20, 2015 #7
    I'm a little stuck in trying to simplify the circuit using the hint. I'm not sure set of nodes to connect
     
  9. May 20, 2015 #8

    CWatters

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    The left and right hand branches are the same and connect to the same points on the centre branch. Here is a quick sketch with the left hand branch moved over to the right hand side. Electrically the circuit is identical to the original.

    Can you see (using symmetry) which points are at the same voltage?

    IMG.jpg
     
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