- #1
gstatejoe
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Hello! I have tried for roughly 3 hours now with no success on this one problem. My professor assigns webassign's (homework submittal process) for just review...which isn't graded or anything and I can't seem to get this one
correct.
[I cannot imitate the emf symbol which looks like a capital script E, so I have subsituted that symbol with 'E'.]
Here is the problem:
In the figure below, the resistances are R1 = 1.3, R2 = 1.5 , and the ideal batteries have emfs E1 = 2.0 V, and E2 = E3 = 4.5 V.
http://img81.imageshack.us/img81/9648/help6nt.gif
The problem asks for the following:
1.) What is the current through battery 1, 2 and 3
2.) and What is the potential difference Va - Vb ?
My answers were:
Batteries 1, 2, 3, = .74 A, .373 A, .373 A
Potential Difference = 3.941 V
Some of the equations I manipulated to get values:
Vb - Va = E2 - IR2 = R1 + (2R1)(2I)
I = (e2 - e1 / 4R1 + R2)
I did the problem in the book which was similar except it had different numbers, and I got that one right. But this one comes out wrong.
Can you guys tell me what I am doing wrong, and if you are able to solve the problem, what values did you get, and more importantly, how did you get them?
THANKS!
Joseph
GSTATE!
correct.
[I cannot imitate the emf symbol which looks like a capital script E, so I have subsituted that symbol with 'E'.]
Here is the problem:
In the figure below, the resistances are R1 = 1.3, R2 = 1.5 , and the ideal batteries have emfs E1 = 2.0 V, and E2 = E3 = 4.5 V.
http://img81.imageshack.us/img81/9648/help6nt.gif
The problem asks for the following:
1.) What is the current through battery 1, 2 and 3
2.) and What is the potential difference Va - Vb ?
My answers were:
Batteries 1, 2, 3, = .74 A, .373 A, .373 A
Potential Difference = 3.941 V
Some of the equations I manipulated to get values:
Vb - Va = E2 - IR2 = R1 + (2R1)(2I)
I = (e2 - e1 / 4R1 + R2)
I did the problem in the book which was similar except it had different numbers, and I got that one right. But this one comes out wrong.
Can you guys tell me what I am doing wrong, and if you are able to solve the problem, what values did you get, and more importantly, how did you get them?
THANKS!
Joseph
GSTATE!
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