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Old 01-26-2010, 03:31 PM
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Any electrical engineers on the org?

Need some help on a homework problem, I think the prof missed an important step in how to solve some of these problems. Think you guys could lend a hand?

So far I have the equation V=RI (ohm's law) P=VI and E=PT
Only equations i have to work with.

heres the problem. Its in a closed circuit, couldnt get the picture up, if your really need to see it i can get it on here.

"A voltage source and two other elements are in series in a circuit. If Vs is 15 V, element 1 has 2 V across it, element 2 has 13 V across it, and 4 A are running through the circuit, find the power being dissipated or supplied by each of the three elements.

Ps= 60 W <---wrong
P1= 8 W <-- correct
P2= 52 W <---correct

I can get the voltages across the first and second element but not across the source. (its an independent voltage source)
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Old 01-26-2010, 04:19 PM
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anyone???????????
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Old 01-26-2010, 04:22 PM
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Is there any way you can get the pic?

Why is 60 W incorrect? That is what I get when I calculate it.

Last edited by 05_PSD_Erik; 01-26-2010 at 04:29 PM.
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Old 01-26-2010, 06:48 PM
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Quote:
Originally Posted by 05_PSD_Erik View Post
Is there any way you can get the pic?

Why is 60 W incorrect? That is what I get when I calculate it.
yea ill see what i can do. I think the teacher might have messed up on the problem. Its on webwork, so i enter the answer and itll tell me if its right or wrong.
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Old 01-26-2010, 07:00 PM
djh djh is offline
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Based on your description of series circuit....60W is correct to me also.
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Old 01-26-2010, 07:26 PM
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Quote:
Originally Posted by djh View Post
Based on your description of series circuit....60W is correct to me also.
I emailed the prof so ill let you know. 60 was what i originally got, but the computer said it was wrong. Im thinkin somethings messed up in the system.
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Old 01-26-2010, 07:35 PM
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I just put this on paper...hope it helps some
Attached Files
File Type: pdf Circuit.pdf (19.5 KB, 38 views)
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Old 01-27-2010, 05:14 PM
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Originally Posted by SteveKran View Post
I just put this on paper...hope it helps some
thanks! still is telling me that 60W is incorrect, but im almost 100% its correct. Prof still hasnt gotten back to me yet, and no one i know in the class has tried the HW yet. Ill get back to you guys about it tho. its just getting frustrated.
Having a similar issue with my online homework for my math class ( same webwork system)
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Old 01-28-2010, 03:16 AM
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I had a professor in college that was so absent-minded that you would have to go back and check your test to make sure what you got wrong, was really wrong. Sometimes he'd mark stuff that was right as wrong. It was like taking the same test twice every time....hated it!
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Old 02-02-2010, 11:16 AM
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answer was -60 lol.
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