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Finding current in a parallel circuit

  1. Feb 8, 2014 #1
    1. The problem statement, all variables and given/known data
    Determine IL in the circuit in the Figure.
    Figure: http://i.imgur.com/PvKXtjX.png

    V1 = ?
    Ix = ?
    IL = ?
    3*Ix current source pointing downwards
    7mA current source pointing upwards
    7mA current source pointing downwards
    7kOhm resistor
    1kOhm resistor

    2. Relevant equations
    Ohm's law, KCL

    3. The attempt at a solution
    The hint to the problem told me to: "Write a KCL equation at the top node and express any control variables for dependent sources in terms of the unknown node voltage."

    So, I wrote the equation and I got:

    V1/5kΩ+3(V1/5kΩ)+V1/7kΩ+V1/1kΩ=0

    I'm not quite sure where to go from here or how this form would be useful to me. Any pointers on where I should go from here? Thank you
     
  2. jcsd
  3. Feb 9, 2014 #2

    NascentOxygen

    User Avatar

    Staff: Mentor

    It looks like V1=0. Nothing else solves that equation.
     
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