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Short circuit current

  1. Mar 12, 2014 #1
    1. The problem statement, all variables and given/known data
    http://postimg.org/image/b8p4rszot/

    There is a short circuit between the terminals a-b

    2. Relevant equations



    3. The attempt at a solution

    so I found the node voltages at 1 and 2, but I don't know how to use these to get the short circuit current...
     
  2. jcsd
  3. Mar 12, 2014 #2

    berkeman

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    Staff: Mentor

    If the short circuit current is just the current that flows in the a-b wire when terminals a and b are shorted, it would look to inolve the 3A current source and the current through the 16 Ohm resistor...
     

    Attached Files:

  4. Mar 12, 2014 #3
    whats the current through the 16ohm resistor that enters terminal a? is it 3A?
     
  5. Mar 12, 2014 #4

    berkeman

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    Staff: Mentor

    Beats me. Show us your KCL equations and your solution of them. We can check your work.
     
  6. Mar 13, 2014 #5
    http://postimg.org/image/4b0617wj1/

    I tried writing KCL equation's at the nodes marked to solve for the short circuit current but they're incomplete since I don't know how to express the current through the 16 ohm resistor entering/exiting those nodes
     
  7. Mar 13, 2014 #6

    berkeman

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    Staff: Mentor

    I = V2 / 16 Ohms
     
  8. Mar 14, 2014 #7
    ok thanks

    also, does the short circuit current through a-b include anything of the 3A current source?
     
  9. Mar 14, 2014 #8

    NascentOxygen

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    Staff: Mentor

    Yes, assume it does and proceed to form the node equations accordingly.
     
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