Solving an Electrical Problem: 79.2V Answer

[mugzieee]

hello. I was reading through the chapter, and i came across a practice problem. The given answer for the problem is 79.2V. I attemted to solve it, but i don't get the same answer. ICould you guys please help me out and tell me where i am making a mistake? Thanx in advance

http://www.freeimagehosting.net/uploads/th.d669771024.jpg

 

[teknodude]

Might want to just print screen, copy/paste and upload the work to imageshack or something.

 

[mugzieee]

ok here's the URL of the work

[img=http://www.freeimagehosting.net/uploads/th.d669771024.jpg]
http://www.freeimagehosting.net/d669771024.jpg

[img=http://www.freeimagehosting.net/uploads/d669771024.jpg]
there's a bunch of links to the image, this is my first time using this imageshack thing so i wasnt sure which link to use, i think if u copy and paste this link into the browser it works.

http://www.freeimagehosting.net/uploads/d669771024.jpg

 

[teknodude]

first off you can't solve these 2 equations that you have, because you have 3 unknowns and 2 equations. You need another equation.

I see you used a supermesh for mesh 2 and 3, however you don;t need it. That is a current controlled voltage source there. This is why you are missing one equation. It would be a different story if there was a current source there.

 

[Cyrus]

I can't open your file or get any of your links to work to see the Circuit Diagram.

 

[teknodude]

I can't open your file or get any of your links to work to see the Circuit Diagram.

They aren't linked correctly, so you have to copy and paste it. Copy and paste the 3rd link and edit it to a basic URL.

first off you can't solve these 2 equations that you have, because you have 3 unknowns and 2 equations. You need another equation.

my mistake, i looked at your work briefly and just saw the two numbered equations. I did the problem this time and get 79.2V. Your currents should be i1 = 3.08A i2=2.27A and i3=1.98