# Node voltage time domain circuit

Discussion in 'Homework Help' started by jstrike21, Oct 29, 2009.

1. ### jstrike21 Thread Starter Member

Sep 24, 2009
104
0
I have the two node equations set up

Node A: -10 + V1/10 + (v1-v2)/(1+j56.55)=0
Node B: (v2-v1)/(1+j56.55) - v2/j299.16 + v2/5=0

I have no idea how to solve this...

updated the pdf attached

• ###### RelativeResourceManager7.pdf
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Last edited: Oct 30, 2009
2. ### t_n_k AAC Fanatic!

Mar 6, 2009
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Not sure what relevance is the attached file....?

Was it meant to show your working?

3. ### jstrike21 Thread Starter Member

Sep 24, 2009
104
0
attached file is the actual assignment

4. ### t_n_k AAC Fanatic!

Mar 6, 2009
5,448
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Attachment looks like a set of lecture notes which seem to have no connection with your nodal equations.

5. ### jstrike21 Thread Starter Member

Sep 24, 2009
104
0
o crap wrong attachment ill put the new one u[p

6. ### t_n_k AAC Fanatic!

Mar 6, 2009
5,448
789
In any case you need to re-arrange the equations first by collecting the coefficients of the common variable terms (v1 & v2) into the standard form for solution.

Node A:

V1(1/10+1/(1+j56.55))-V2/(1+j56.55)=10

Node B:

-V1/(1+j56.55)+V2(1/(1+j56.55)+1/5-1/j299.16)=0

If you have Matlab or something equivalent which handles complex number matrices you can solve the two equations simultaneously for V1 & V2. Otherwise you have to do it long hand which is a fair amount of work.

7. ### jstrike21 Thread Starter Member

Sep 24, 2009
104
0
thanks for the help, i found a way to solve it on my ti-89