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United States4024 Posts
Okay, so I have sat back in my chair chuckling at those with those "ezpz lmn sqz" physics problems until I got slapped with a D on one of my quizzes =\. My teacher offered to let everyone to correct their problems to receive half of their points back...
I feel as if in this question, I am missing something, because I almost have it, yet I am so far away...
This is the one I have yet to figure out:
(Quick and dirty drawing. Should be and good enough)
If the current in the 8 ohm resistor is I=5/14 A going up, what is the current through the 4 ohm resistor?
Okay, now for the other:
Just a quick thing, as I was typing this, I ended a few sentences with a semicolon, lmao... Java is getting to me.
Next: For those of you that play guitar (It's about acoustic)
I'm planning on changing strings to get some variety out of my guitar, so I came across a question: I know the definition difference between mellow and bright sounding strings, but could anyone link me to videos, song, or give any explanation demonstrating the differences so I can try to figure out on which I want?
 
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United States24799 Posts
How could the current be going up through the 8 ohm resistor? You have a negative current leaving the negative terminal instead of a positive current leaving the positive terminal?
Well putting that aside, I believe if you take a Kirchhoff loop of the right side, then you can find the voltage of the 4 ohm resistor. Then you can apply Ohm's Law to that resistor.
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Why did they ban homework help btw, I can't find it anywhere?
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You know the current and the resistance of the 8 Ohm resistor. Find the voltage, and use it to calculate voltage on the 4 Ohm res., using II Kirchoff's law.Repeat the process for the left loop. Throw in Kirchoff's first law to calculate missing curents.
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Loop rule the right loop:
8*(5/14) + 4i -25 -5 = 0
i = 190/28
that's probably wrong but w/e
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As micronesia pointed out, tha current can't be going up, it's pretty evident when you look at the batteries. Besides, the direction of the current doesn't matter if you are just calculating stuff like resistance and voltage and such.
As people have said, you just use the Kirchoff's second law to crack this nut open. You can form up to 3 different loops (dunno if you need that many) and then just calculate the missing values.
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EPT![[image loading]](http://i98.photobucket.com/albums/l241/mmrk923/Physics.jpg)
