circuit analysis using nodal analysis please help

Thread Starter

xt3rmin8

Joined Sep 1, 2008
9
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:confused:
if someone could explain

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

Attachments

Yaz Li

Joined Jul 27, 2010
1
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.
 
Top