Discussion in 'Homework Help' started by xt3rmin8, Feb 13, 2009.

1. ### xt3rmin8 Thread Starter New Member

Sep 1, 2008
9
0
im trying to use nodal analysis to solve for node 'Va' but i don't know what to do in that situation were the resistor is next to the voltage source
if someone could explain

would node vb [(-20-Vb)/8] + vb/4 +5 =0 ?

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2. ### xt3rmin8 Thread Starter New Member

Sep 1, 2008
9
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LOL nevermind i figured it out so eaasy

3. ### Yaz Li New Member

Jul 27, 2010
1
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For others who may have similar problems:

There two other nodes that you should also consider them. They are the one between the R5 and V2 (label it as C) and the one between V1 and R2 (label it as D). In this example, I would recommend to define the bottom node as the reference node. With this selection, we already have the voltages of nodes C and D. VC=V2=20V and VD=V1=40V.

KCL @ Node A:
(VA-VC)/R2+(VA-VB)/R3+I1=0

KCL @ Node B:
-I1+(VB-VA)/R3+VB/R4+(VB-VD)/R5=0.

I have a similar problem solved here. For a free ebook on Nodal Analysis, check out this.