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Parallel voltage sources circuit 
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#55
Jul911, 02:33 AM

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P: 6,187

I just love it when you're mad cyber grrr!!!
*Sees you storming off* Wait! Come back! And do you recall Sauron who mispointed on a small one? It cost him everything!!! And yes, the difference is just a minus or a plus. Since you usually get dramatically different results if you make a mistake with one, it's an important part of the answer. 


#56
Jul911, 02:42 AM

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P: 6,187

Here's one that's more like what you ask for.
Determine the currents I_1, I_2, and I_3 in the figure. Assume the internal resistance of each battery is 1.0 Ohm. I1, I2, I3 = __________ A What is the terminal voltage of the 6.0V battery? Vt = _____ V 


#57
Jul911, 02:49 AM

PF Gold
P: 2,551

That's a great one, thanks! I'll work on it now!
Sauron mispointed on a small one? I don't recalll that! Was that the book or the movie? 


#58
Jul911, 02:55 AM

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P: 6,187

Sauron misplaced one small ring, that was picked up by one small guy.
He never thought it would matter, especially since not even the great white wizard (Saruman) could withstand his corrupting power. :) (Both in the books and in the movies.) 


#59
Jul911, 03:08 AM

PF Gold
P: 2,551



#60
Jul911, 03:10 AM

PF Gold
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#61
Jul911, 03:28 AM

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What are you unsure of? Or rather, what do you need to be sure? 


#62
Jul911, 03:33 AM

PF Gold
P: 2,551

I'll take it as "you're right"
No, I'm not "unsure" anymore, I looked at it for a while and it makes sense now! 


#64
Jul911, 03:47 AM

PF Gold
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#65
Jul911, 05:25 AM

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P: 6,187

You have a mistake in your second equation.
And I would suggest doing the math, because I think you have not practiced it enough. Moreover, you have made the math harder for yourself because you took the entire enclosing loop instead of just the lower loop. 


#66
Jul911, 06:03 AM

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I agree there is a mistake in the 2nd equation, but it may not be entirely mathematical.
It could be a conceptual one concerning voltage sources. Taking the larger loop only adds one additional term versus the bottom loop. Not a large enough difference in math to be concerned. Either way results in 3 equations with 3 unknowns, which may be solved using standard technique. 


#67
Jul911, 06:09 AM

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The mistake is because I copied/pasted the first equation to the second equation to make the process of typing down the second equations easier, then I started deleting terms but I accidentally didn't delete the +12. It's just a typo type of mistake again, really



#69
Jul1011, 04:30 AM

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Hey Fp!
I was wondering if I'd see you today. And I can actually see you! I see you worked the problem out carefully now. And yes! It worked! You have the right answer! How does it feel? That leaves the second part of the problem.... 


#70
Jul1011, 05:29 AM

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w00t! Thanks
Hmm my hair looks kinda too frizzly! Wait before we get to the second part I want to ask a question from the test I had.... I finally see I have a copy of the test so I can post it.. I think I'll start a different topic for that 


#71
Jul1011, 05:33 AM

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Well, the second part of the problem is almost trivial now.
I mainly attracted your attention to it, since in a real test, you should make sure that you do not forget to answer all the questions, just because you think you're done. 


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