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Help. Resistance question? -- I'm electronic illiterate. - Page 2

post #11 of 22
Thread Starter 
I figured it out. The fan leads are fine.

Now, mixing up the 5v and the 12v leads when you're splicing the 4 pin to PSU. That can cause an issue.

Thanks for the responses folks. I asked a question with "help" in the title and had 4 responses in a matter of minutes. What an awesome community.
post #12 of 22
Quote:
Originally Posted by Warfarin88 View Post
Not sure where the best place to ask this is.

Question is about wiring.

I know (or at least I think I know) that the length of a wire can reduce the current that flows along it before it gets to the end point. That's why you need a heavier gauge extension cord to run a high draw appliance without blowing fuses.

What's the mechanics here?

Can the gauge of a wire increase resistance?

To frame it terms of what I'm dealing with, if I used a relatively heavy (20ish) gauge wire to extend fan leads a short distance (around a 12-18 inches) could this create enough resistance that a higher watt fan wouldn't power up?

I've troubleshot all of my wiring, and everything mechanically is sound. If I don't use the leads, the controller will power the higher wattage fan. If I use a lower wattage fan, the controller will power the fans with the leads I made.

I'm trying to figure out why the leads don't work with the higher powered fans, and what I might be able to do to fix it.

Thanks a ton in advance for any assistance!


The wires appear to electrons as tubes.

Obviously, there's less resistance with a bigger tube.

10gauge wire has half the resistance of a 20-gauge wire, length and material being equal.

A high-power device will still run, just at less power. You risk heating up the cord and starting a fire, however, so if you notice your fan's not revving as high as it used to, you need bigger wires.
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post #13 of 22
Quote:
Originally Posted by TestECull View Post
The wires appear to electrons as tubes.

Obviously, there's less resistance with a bigger tube.

10gauge wire has half the resistance of a 20-gauge wire, length and material being equal.
10A on 20AWG moving 10ft experiences 17.42% vdrop.
10A on 10AWG moving 10ft experiences 1.74% vdrop.

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post #14 of 22
Thread Starter 
Quote:
Originally Posted by TestECull View Post
10gauge wire has half the resistance of a 20-gauge wire, length and material being equal.
That was my understanding. You just worded it much better. Thank you.

I think I sorted what the issue was though. (see post above)
post #15 of 22
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
10A on 20AWG moving 10ft experiences 17.42% vdrop.
10A on 10AWG moving 10ft experiences 1.74% vdrop.

LOL. I give up. Bigger = Better. Now THAT is language I can understand.

Where's my hammer? All this technical stuff skeers me.
post #16 of 22
Quote:
Originally Posted by l V l View Post
I wouldn't say the wire itself is the thing that has more resistance with length... I would say the length just increases the amount of things getting in the way... Examples being the air around it, things that it touches, metals near it, etc etc... If the wire was floating in pure space, electricity should in theory not go down (current wise) from one end to other.


PS: Sorry that my reply really does not help you...
The resistance of the wire is a factor whether it be in space or not. Environments can cause issues but the main deal is that wire has a resistance of its own, ohms. You have to push more amps to get electricity through a high ohm wire. The longer the wire the more resistance. Common sense. If there is 1 ohm in 1 foot of 20guage wire then it seems quite plausible you will double the ohms when you double the length of the wire.
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post #17 of 22
Quote:
Originally Posted by MrQ View Post
The resistance of the wire is a factor whether it be in space or not. Environments can cause issues but the main deal is that wire has a resistance of its own, ohms. You have to push more amps to get electricity through a high ohm wire. The longer the wire the more resistance. Common sense. If there is 1 ohm in 1 foot of 20guage wire then it seems quite plausible you will double the ohms when you double the length of the wire.
FYI you don't give amps, its the result of voltage/resistance .
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post #18 of 22
Quote:
Originally Posted by Tyrker View Post
FYI you don't give amps, its the result of voltage/resistance .
Current actually, is the actual flow of electrons. Voltage is just a difference.

I could go into each very very detailed, but most of you guys would be well confused.
    
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post #19 of 22
Quote:
Originally Posted by keith27 View Post
Current actually, is the actual flow of electrons. Voltage is just a difference.

I could go into each very very detailed, but most of you guys would be well confused.
Try me .

On topic, current=Voltage/Resistance and the only variables you can control is voltage and resistance thats the only way you can change current (unless you want to get into magnetism like in some junctions).
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post #20 of 22
Quote:
Originally Posted by Tyrker View Post
Try me .

On topic, current=Voltage/Resistance and the only variables you can control is voltage and resistance thats the only way you can change current (unless you want to get into magnetism like in some junctions).
I'd try you, but you never really asked a question.

Current is equal to a lot more than just the division of voltage and resistance. But I'm sure you'll google that
    
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