Nodal analysis problem

[cheypr]

OK here is the problem: use nodal analysis to find Vo in the circuit at R6. It is supposed to be 7.57v.

[hgmjr]

If you will post what you have done so far to solve the problem we can help you get past your snag point.

hgmjr

[cheypr]

OK and here is what did. This is the closest I've become. What I'm doing wrong?

[cheypr]

Originally Posted by hgmjr

If you will post what you have done so far to solve the problem we can help you get past your snag point.

hgmjr

wow, your fast, jejejejejje

[cheypr]

this could help. its a solutio to the problem. the solution is so quick that i dont see how they found the answer.

[The Electrician]

Originally Posted by cheypr

this could help. its a solutio to the problem. the solution is so quick that i dont see how they found the answer.

I don't see how they get an answer, either. They only have 4 equations, but there are 5 unknowns. The current Is2 doesn't appear in any of their equations, but surely it has an effect on the solution.

Perhaps they got an answer from a solution book.

[cheypr]

Originally Posted by The Electrician

I don't see how they get an answer, either. They only have 4 equations, but there are 5 unknowns. The current Is2 doesn't appear in any of their equations, but surely it has an effect on the solution.

Perhaps they got an answer from a solution book.

thanks, any other idea or suggestion in how to solve this exercise.

[The Electrician]

Your equation for SN2 is incorrect.

You have:

-(1/1k)Va + 0Vb + (1/1k+1/1k)Vc + (1/1k)Vd = -.002

You should have:

-(1/1k)Va + 0Vb + 0Vc + (1/1k+1/1k)Vd + (1/1k)Ve = -.002

Then your matrix will be:

[ .0025  -.0005 -.001 ]
[ -.0005  .001    0.  ]
[ -.001    0.    .003 ]

Solving will give you :

Va = .69565
Vb = 4.3478
Ve = 7.5652

[cheypr]

Thanks a lot. You all are a good help!!

[t_n_k]

Just for 'fun' I thought I'd try a different approach .... I know - I should 'get a life'.