Resistance wire

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  #1  
Old 01-20-14, 05:40 AM
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Resistance wire

I have a 12V, 1A transformer I would like to use.
I have a resistance wire of 25 Ohm / meter (8.3 Ohm / foot).
To use this cable I need 48 centimeters (18.9").
This is too long, but is it possible to go 24 centimeters up and 24 centimeters back with the wire to obtain the same length?
If I cut two pieces of 24 and attach them both to electricity I think my resistance changes, no? This is not usable?
If the wires would touch eachother, would that change the resistance?
I have a picture below:



Hope someone can help me!

Thomas
 

Last edited by thodesmet; 01-20-14 at 06:21 AM.
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  #2  
Old 01-20-14, 06:33 AM
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Your first option will give you 48" of wire, so a total of about 33 ohms resistance. They would have to remain separated. If they touch, the resistance would drop significantly.

Your second option would give you 1/2 the resistance of each wire. So you'd end up with (8.3ohms * 2 feet) / 2 wires = 8.3 ohms

Hope this helps. If you let us know what you're actually trying to do, we may be able to help more.

-Mike
 
  #3  
Old 01-20-14, 06:36 AM
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Your 1st plan would do what you want...but the wires cant touch except at the end as shown. Your 2nd would actually halve the resistance because the 2 wires (resistors) are in parallel.
 
  #4  
Old 01-20-14, 05:46 PM
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"Situation 1" would give you 13.07 ohms and "Situation 2" would give you 4.15 ohms. What exactly are you trying to do and why the strict requirements for wire length? And how thin is your wire such that it is 8.3 ohms per foot? That is a huge amount of resistance for such a short length. Are you sure you are measuring the resistance properly?
 
  #5  
Old 01-20-14, 07:30 PM
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Maybe it's for his bag sealing project.

http://www.doityourself.com/forum/el...rome-wire.html
 
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