node voltage analysis

Thread Starter

Hawkeye87

Joined Oct 7, 2008
52
ok, i'm stuck on this problem that's due tomorrow morning. I've worked it out and i get stuck right near the end. if anyone could help me i greatly appreciate it. The question says to find the voltage at node A.
 

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hgmjr

Joined Jan 28, 2005
9,027
It looks like all that you have left is to take your final equation and set it equal to zero and solve for Va.

hgmjr
 

hgmjr

Joined Jan 28, 2005
9,027
well i free handed it and i got something like 1.73 V did anyone get the same thing?
If you post the steps that you went through to obtain the answer you provided, then we can determine where you went off the rail.

The answer I obtained was 28.308116V.

hgmjr
 
Hawkeye87:

I apparently need to learn the nodal method myself! I saw the answer hgmjr provided; then reworked my solution using mesh analysis (see attachment). I ended up with the same answer as hgmjr:

Va=28.307 volts
 

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Thread Starter

Hawkeye87

Joined Oct 7, 2008
52
i have an exam one week from today and i have a practice exam that's due wednesday. If i upload it on here could someone guide me through it if i get stuck?
 

hgmjr

Joined Jan 28, 2005
9,027
Go ahead and post your problems here in the homework section.

I would strongly encourage you to take a stab at the problems yourself and post what you have done.

If you get us to solve the problems for you without any effort on your part, then we are simply ushering you toward failure. We don't want that and you certainly don't want that.

Working practice problems is the only way to internalize the process. I would not stop with the practice problems. You can find many worked problems on the Internet. I would search for problems that have been solved and work toward understanding how they were done.

hgmjr
 

Thread Starter

Hawkeye87

Joined Oct 7, 2008
52
You can find many worked problems on the Internet. I would search for problems that have been solved and work toward understanding how they were done.

hgmjr
would you happen to know of a place that i can find already worked problems that show the steps on how they got the answer?
 

hgmjr

Joined Jan 28, 2005
9,027
would you happen to know of a place that i can find already worked problems that show the steps on how they got the answer?
What type of problems do you need the most exercise on? (e.g. nodal analysis, mesh analysis, kirchhoff's voltage law, kirchhoff's current law, Millman's Theorem, Superposition)

hgmjr
 

Thread Starter

Hawkeye87

Joined Oct 7, 2008
52
i can't really do much with reading text like that. i'm more of a visual learner and need to see examples myself and see how they worked through the problem and everything.
 

hgmjr

Joined Jan 28, 2005
9,027
Go ahead and post your problems with any work you have been able to do thus far.

Then we can see where that takes us.

hgmjr
 

Thread Starter

Hawkeye87

Joined Oct 7, 2008
52
alrighty. sure will. give me a day or so to work on them an i'll edit this thread with the problems. there are only 4 problems.
 

Thread Starter

Hawkeye87

Joined Oct 7, 2008
52
thank you kindly. i'll be working on them tonight and through tomorrow then copy them in here and see if i get the right answers.
 
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