# supernodes - KCL?

Discussion in 'Homework Help' started by mccormick.cj, May 27, 2008.

1. ### mccormick.cj Thread Starter Member

May 25, 2008
10
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hey guys, one more question. sorry, not trying to abuse the system.

is anyone familiar with supernodes in circuit analysis with KCL?
and if so, are they even that useful?

thanks

2. ### haditya Senior Member

Jan 19, 2004
220
0
supernode is just a convenient technique of eliminating one equation from the nodal analysis equations. It is usually not needed.
What is generally done is two (non - reference nodes) between which an souce is connect is considered as a supernode and currents entering the super node is equated to the current exiting the supernode as is done in nodal analysis.
For more and an example, you can refer to Hayt, Kimmerly, Durbin, Engineering Circuit Analysis

Supermeshes are similar only they involve a current source between two meshes.

3. ### mccormick.cj Thread Starter Member

May 25, 2008
10
0
in your opinion, are the supernodes easier to work with, or more trouble than they are worth? I have learned about supermeshes and that method does come in handy on occasion.

4. ### haditya Senior Member

Jan 19, 2004
220
0
the thing is.... you eliminate one equation (for every supernode) without having to wite it down. So yeah in that sense it does come in handy.
however if you fail to account for them in a circuit, you wouldnt go wrong in normally solving them using nodal analysis and an unknown value of current through the voltage source. Two of those equations will have that unknow current tern that you can eliminate. this will eventually lead to the supernode equation

5. ### mccormick.cj Thread Starter Member

May 25, 2008
10
0
ok sounds good, thanks alot