Old 11-1-2008, 08:54 PM   #1
sayuncle990
SIU Making a COMEBACK
FFR Veteran
 
sayuncle990's Avatar
 
Join Date: Sep 2005
Age: 32
Posts: 513
Default [High School -Physics] Resistor Networks

First of all, sorry if this is in the wrong forum. I didn't see any other place to put it.

So I got this homework to do, and I've pretty much figured it all out using a bus diagram, except for one part. I don't know how to approach Resistors 7 through 9 and 10 through 12. The only idea that I have is that they equalize between 7 and 8, and 10 and 11. If anyone actually knows how to approach this, I would very grateful for any help. Thanks.



This is the only idea I have as far as a bus diagram:



One last thing: Just a check on how to find the currents at E and D: Do I just add up all the currents traveling along each separate loop?
__________________


Quote:
Originally Posted by popsicle_3000 View Post
wow, not having a girlfriend must have done wonders to my ability to jack well!

Last edited by sayuncle990; 11-1-2008 at 08:58 PM..
sayuncle990 is offline   Reply With Quote
Old 11-1-2008, 09:06 PM   #2
robertsona
missa in h-moll
FFR Simfile Author
 
robertsona's Avatar
 
Join Date: Dec 2006
Location: nyc
Age: 28
Posts: 3,994
Default Re: Need Help With Physics Homework - Resistor Network

Critical Thinking>Homework Help
__________________
robertsona is offline   Reply With Quote
Old 11-1-2008, 09:10 PM   #3
sayuncle990
SIU Making a COMEBACK
FFR Veteran
 
sayuncle990's Avatar
 
Join Date: Sep 2005
Age: 32
Posts: 513
Default Re: Need Help With Physics Homework - Resistor Network

Sorry then, I saw

Critical Thinking (3 Viewing)
An area specifically for higher-level thinkers. Debates, Essays, Politics etc.

And thought that homework wasn't the right area. Is there anyway I can move it? Or does a mod have to do that?
__________________


Quote:
Originally Posted by popsicle_3000 View Post
wow, not having a girlfriend must have done wonders to my ability to jack well!
sayuncle990 is offline   Reply With Quote
Old 11-1-2008, 09:16 PM   #4
sumzup
(+ (- (/ (* 1 2) 3) 4) 5)
FFR Veteran
 
sumzup's Avatar
 
Join Date: Nov 2005
Location: Seattle
Age: 32
Posts: 1,398
Send a message via AIM to sumzup Send a message via MSN to sumzup
Default Re: Need Help With Physics Homework - Resistor Network

A mod will have to do that. PM devonin or squeek (they're online right now); they should be able to do it.
__________________
sumzup is offline   Reply With Quote
Old 11-1-2008, 09:18 PM   #5
rzr
TWG Veteran
 
rzr's Avatar
 
Join Date: Oct 2007
Location: ƲƝƌƐƦ ƮĦƐ ƧƐȺ
Age: 32
Posts: 7,608
Send a message via AIM to rzr Send a message via MSN to rzr Send a message via Yahoo to rzr Send a message via Skype™ to rzr
Default Re: Need Help With Physics Homework - Resistor Network

Don't bother.
__________________

Quote:
Originally Posted by darkshark View Post
Everyone sucks at this game. The second you think you're good is the second you stop trying to get better.
Quote:
Originally Posted by aperson View Post
i had a mri the other day it was the best song i heard in years

Quote:
Originally Posted by Sprite-
More of a joke than the time I deleted all the credits on the site.
Quote:
Originally Posted by MinaciousGrace View Post
yeah my goldfish think im a riot they do this thing where they turn upside down and float to the top of the tank

i guess their alcohol tolerance isnt as high as mine
rzr is offline   Reply With Quote
Old 11-1-2008, 11:28 PM   #6
Izzy
Snek
FFR Simfile AuthorFFR Veteran
 
Izzy's Avatar
 
Join Date: Jan 2003
Location: Kansas
Age: 33
Posts: 9,192
Default Re: Need Help With Physics Homework - Resistor Network

I doubt many people are willing to do more homework then they are already given.
Izzy is offline   Reply With Quote
Old 11-2-2008, 01:27 AM   #7
devonin
Very Grave Indeed
Retired StaffFFR Simfile AuthorFFR Veteran
 
devonin's Avatar
 
Join Date: Apr 2004
Location: Ontario, Canada
Age: 40
Posts: 10,098
Send a message via AIM to devonin Send a message via MSN to devonin
Default Re: Need Help With Physics Homework - Resistor Network

Quote:
Originally Posted by rzr View Post
Don't bother.
Dude, shut it. Don't tell people not to bother using a forum for its express intended purpose. If -YOU- don't want to help, fine, stay out of my forum.
devonin is offline   Reply With Quote
Old 11-2-2008, 01:43 AM   #8
sn1per9mm
FFR Player
 
Join Date: Jul 2006
Posts: 4
Default Re: [High School -Physics] Resistor Networks

I'm glad we have never had to work with that big of a circuit.

If I'm understanding your question correctly:
7-9 and 10-12 are series, and are both series are in parallel.

So you know that:
R(7 to 9) = R7 + R8 + R9
R(10-12) = R10 + R11 + R12

Then set them up in parallel:
[1/R(7to9) + 1/R(10to12)]^-1
sn1per9mm is offline   Reply With Quote
Old 11-2-2008, 08:11 AM   #9
sayuncle990
SIU Making a COMEBACK
FFR Veteran
 
sayuncle990's Avatar
 
Join Date: Sep 2005
Age: 32
Posts: 513
Default Re: [High School -Physics] Resistor Networks

I thought about that, but it starts and ends at 24 Volts. So how would the current react? Because if V=IR, then the current throughout that would be zero, because the drop is zero. But are you saying that that does not matter, and I can treat it as a normal parallel series?
__________________


Quote:
Originally Posted by popsicle_3000 View Post
wow, not having a girlfriend must have done wonders to my ability to jack well!
sayuncle990 is offline   Reply With Quote
Old 11-2-2008, 11:07 AM   #10
sn1per9mm
FFR Player
 
Join Date: Jul 2006
Posts: 4
Default Re: [High School -Physics] Resistor Networks

The current through it couldn't be zero because the Junction Rule states that the total current into it is equal to the total current out of it.
sn1per9mm is offline   Reply With Quote
Old 11-2-2008, 12:16 PM   #11
sayuncle990
SIU Making a COMEBACK
FFR Veteran
 
sayuncle990's Avatar
 
Join Date: Sep 2005
Age: 32
Posts: 513
Default Re: [High School -Physics] Resistor Networks

But if I treat it as a series, and come out with a 24 Ohm resistor on the top, I know the drop in voltage across that is zero volts. Using Ohm's law, it would come out as I = V(zero)/24 Ohms. This makes the current zero, and thus every drop zero volts. I don't know how else to look at it. We didn't cover any Junction Rule...But then again if the current going in is zero, then the current go out is still zero.
__________________


Quote:
Originally Posted by popsicle_3000 View Post
wow, not having a girlfriend must have done wonders to my ability to jack well!
sayuncle990 is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT -5. The time now is 04:03 AM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright FlashFlashRevolution