finding ix by one equation using Super node

Discussion in 'Homework Help' started by Meshoo, Sep 21, 2012.

  1. Meshoo

    Thread Starter New Member

    Sep 21, 2012
    1
    0
    Hi can you please help me with the first question part a & b?

    I tried to combine two nodes together and let them a super node to find ix but I got a wrong result.







    Thanks:)
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,743
    4,795
    What two nodes did you try to combine?

    What did you do to get whatever result you got?

    How do you know what you got was wrong?

    We aren't mind readers; it is extremely useful for us to see what you have tried and how you tried it in order to figure out where you are going wrong and how we might lead you back toward a good path.

    Having said that, for this problem just keep in mind the notion of a what a supernode is. Draw a dotted line around several nodes and treat the contents as a black box with a bunch of ports. In general, you don't know what the relationship is between the voltages at the various ports, but you know that the currents have to obey KCL when looked at as a group. So, do you have any nodes that you can surround with a dotted line such that the unknown current is one of the ports and you know the currents at all the other ports?
     
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