Go Back   Hardware Canucks > CASES & COOLING > Air Cooling

    
Reply
 
LinkBack Thread Tools Display Modes
  #11 (permalink)  
Old July 8, 2008, 12:22 PM
Jack Rabbit's Avatar
Allstar
 
Join Date: Sep 2007
Location: Toronto, ON
Posts: 784

My System Specs

Default

Quote:
Originally Posted by Cptn Vortex View Post
Not too sure what you are talking about. My 3 2200RPM fans all spin at 2200RPM.....when I have them all spliced together.
I am going to guess you have them in parallel, then.
__________________
He either fears his fate too much, or his deserts are small, that dares not put it to the touch, to gain or lose it all.
- James Graham
Reply With Quote
  #12 (permalink)  
Old July 8, 2008, 12:25 PM
MpG's Avatar
MpG MpG is offline
Hall Of Fame
 
Join Date: Aug 2007
Location: Kitchener, ON
Posts: 3,143
Default

Quote:
Originally Posted by Jack Rabbit View Post
It is correct that you would be dividing the voltage. I believe my statement is also correct. Resistive loads (which is what motors basically are when not at stall speed) placed in series will have the voltage and current divided among them in direct proportion to their resistance. Since they are all, probably, very similar loads they would get almost equal amounts of both.
Actually, you don't divide the current across a series setup, since the current is constant throughout the entire circuit. However, in a series circuit, the resistance values are added up directly, which has the effect of increasing the circuit's total resistance, which naturally lowers the current passing through it.
__________________
i7 2600K | ASUS Maximus IV GENE-Z | 580GTX | Corsair DDR3-2133
Reply With Quote
  #13 (permalink)  
Old July 8, 2008, 12:39 PM
DK2 DK2 is offline
Allstar
F@H
 
Join Date: Apr 2008
Location: GTA
Posts: 821
Default

Quote:
Originally Posted by Jack Rabbit View Post
It is correct that you would be dividing the voltage. I believe my statement is also correct. Resistive loads (which is what motors basically are when not at stall speed) placed in series will have the voltage and current divided among them in direct proportion to their resistance. Since they are all, probably, very similar loads they would get almost equal amounts of both.
The current doesnít actually divide though; itís the result of the two fans dividing the voltage between them.
The whole circuit then draws half the current.
The same current flows through both fans.

In parallel the current divides down the two paths provided,
then the whole circuit draws twice the current.

I know, picky picky eh?
Reply With Quote
  #14 (permalink)  
Old July 8, 2008, 12:58 PM
Cptn Vortex's Avatar
Hall Of Fame
F@H
 
Join Date: May 2007
Location: Vancouver
Posts: 3,726
Default

like this. Simple.
Attached Images
 
__________________
The Vortex H20

Coolermaster ATCS 840 w Window panel
MSI Z77A-GD65
Intel i7 3770K @ 4.6GHZ 1.28v
Galaxy GTX 680 @ 1241MHZ
8GB Mushkin Blackline 1600MHZ 9-9-9-24 1.5v
Asus Xonar Essence STX
OCZ Z-Series GOLD 850W
2 x 128GB Corsair Force GT SATA3 SSD RAID0 :)
Acheiva Shimian Q270 Lite 2560x1440

Benq W500 Pojector.

Watercooling:
EK Supreme HF, EK FC GTX 680 Block, MCR320+Gelid Silent 12 Push/Pull, DD Pump, EK Multioption 100ml Res, EK Coolstream XT 220 RAD Gelid Wings Push/Pull.
Reply With Quote
  #15 (permalink)  
Old July 8, 2008, 01:05 PM
DK2 DK2 is offline
Allstar
F@H
 
Join Date: Apr 2008
Location: GTA
Posts: 821
Default

bingo, remember only use the yellow rpm wire from a single fan leaving the 'extra' ones unconnected.
These are outputs from the fans, if you connect them together and one gives a high
signal as the other gives a low, you have a short condition.
Reply With Quote
  #16 (permalink)  
Old July 8, 2008, 01:06 PM
Jack Rabbit's Avatar
Allstar
 
Join Date: Sep 2007
Location: Toronto, ON
Posts: 784

My System Specs

Default

Ok, yeah, you guys are right the current is not divided (or distributed) in series. If the individual devices in the chain have different resistances the voltage drops across each one will vary. The total current will be affected by the increased load. That is where I got confused.

Quote:
Originally Posted by DK2 View Post
I know, picky picky eh?
Yeah but that is good. It has been too long since I studied resistor theory.
__________________
He either fears his fate too much, or his deserts are small, that dares not put it to the touch, to gain or lose it all.
- James Graham
Reply With Quote
  #17 (permalink)  
Old July 8, 2008, 01:11 PM
Top Prospect
 
Join Date: Feb 2008
Location: Brampton, Ontario
Posts: 67
Default

Quote:
Originally Posted by Cptn Vortex View Post
like this. Simple.
/thread

Thanks. That's exactly the explaination I was looking for.
Reply With Quote
  #18 (permalink)  
Old July 8, 2008, 01:17 PM
DK2 DK2 is offline
Allstar
F@H
 
Join Date: Apr 2008
Location: GTA
Posts: 821
Default

Occam's razor wins again, damn
Reply With Quote
Reply


Thread Tools
Display Modes