Need help on solving this circuit..

[Itchrelief]

Originally posted by: blahblah99

Originally posted by: RESmonkey
I just did the problem w/ help of a friend. He said it took him 8 tries, but he got it. It didn't involve the stupid current source at all. Nor did it involve R2 and R3. It was just Va - Vb = I1 x R1. Finding I1, I just multiply and enter answers.

Thanks for all your help guys!

edit = looks like blueshoe's got it ^

Not sure why you think the current source doesn't affect the circuit... but I guarantee you the right answer involves solving the circuit with the current source.

I think you are correct in terms of the circuit behavior, but they give so much information that you essentially don't need to solve for anything using the value of Is. I think this problem would have been more fun if the node voltages had been omitted.

[holy shit too slow again]

 

[RESmonkey]

Originally posted by: blueshoe

Originally posted by: blahblah99

Originally posted by: RESmonkey
I just did the problem w/ help of a friend. He said it took him 8 tries, but he got it. It didn't involve the stupid current source at all. Nor did it involve R2 and R3. It was just Va - Vb = I1 x R1. Finding I1, I just multiply and enter answers.

Thanks for all your help guys!

edit = looks like blueshoe's got it ^

Not sure why you think the current source doesn't affect the circuit... but I guarantee you the right answer involves solving the circuit with the current source.

Yes it definitely affects the circuit, but it isn't needed to solve the problem because the node voltages are already given. If the node voltages weren't given he'd have to use a method like KVL or KCL.

I'm guessing the node voltages were given because it is near the beginning of an introductory circuits class and methods using KVL, KCL, and superposition haven't been taught yet.

KVL and KCL I can do; we were taught that last week. Superposition? not yet.