Circuit calculation help

Thread Starter


Joined Mar 7, 2009
Question 3
Find I1, if R4=2Ω and R2=R3=8Ω

Question 4
Find the node voltages VA,VB, and VC; Remember the use of a ground is the poitn of reference for all node voltages. Hint the 10V source and adjacent nodes A and V form a common "supernode", write a governing equation for the supernode.



Joined Jun 6, 2008

Question 3:
A 9 ohm, an 18 ohm, and a 6 ohm (2+8||8) are all in parallel with the 3 ohm through which I1 flows. After further analysis, you should realize that the 3 ohm (through which I1 flows) is in parallel to this combination of the other three resistors, which yield 9||18||6 = 3. Therefore, I1 = Is/2.

Question 4:
Try nodal analysis? Don't forget about the supernode!!!
Hint: VB = -12 V.