Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: One Term is missing for Circuit Analysis Help to Solve it?

  1. Feb 14, 2007 #1
    1. The problem statement, all variables and given/known data

    Find I_0 using Nodal Analysis.

    http://img263.imageshack.us/img263/394/untitledph7.png [Broken]

    I'm kind of lost for where my box is on the upper right corner. I don't know how to model the 20v Vsource as a current... can you even do that? I've done the other nodes, though I'm not particularly sure yet.
     
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Feb 14, 2007 #2
    Hmm.. I'm having second doubts. Is the connection between the V3 and V1 one single node or is there another node in the middle (near that big blob of dot that I have there.. above the second 1k resistor from the left)?
     
  4. Feb 15, 2007 #3
    No it's the same as the V3 node.
     
  5. Feb 15, 2007 #4
    You have missed out the (v3-v1)/1k current when you took the KCL on supernode 3-4. Apart from that, due the to 20V source, node 4 and the reference node will form a supernode, hence you'd have a (super-)supernode 3-4-ref.

    Try again.
     
  6. Feb 15, 2007 #5
    Wait... I thought I put that down? It's the first term when I start writing my KCL equation for the supernode.

    I see. You're right. I completely forgot about having a super-super-node!!
     
  7. Feb 15, 2007 #6
    Whoops. I meant the (v3-v2)/1k current.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook