Relation b/w elctrical resistance and stress-strain

ank160

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.

AlephZero

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.

ank160

Thanks for the explaination.