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Relation b/w elctrical resistance and stress-strain

  1. Jan 5, 2013 #1
    Hey All!!

    My question is regrading a subtle observation that i made when i was straing at my "spring coil type" room heater. Accidently i pulled up some stands of heating coil spring to make them straight section (obviuosly when it was switched off). Then, when i passed current through it, after some time, i found that the straight section's color was less "red hot" than the other part of spring.

    Does it has anything to do with change in electrical resistance with stress-strain.

    Please explain.
  2. jcsd
  3. Jan 5, 2013 #2


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    More likely, this is because there is more cooling air flow around the length of straight wire than around the same length of "coiled up" wire.
  4. Jan 6, 2013 #3
    Thanks for the explaination.
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