Thank you all for your help.
Turns out I was on the wrong track! First, I have been under the
assumption that the resistivity curve was non-linear over this wide a
range. Turns out that the normal equation still works here. ( Rho-subT
= Rho-sub20*(1 + Alpha-sub20*(T-20)) This leads to about 5.3 or 5.1
depending on what assumptions you make. My 4.3 number, it turns out, was
irrelevant!
So, I apologize for the exercise. But thanks for the support.
Doug Brooks
Doug Brooks wrote:
I would like to know the resistivity of copper at 540 degrees C,
assuming it is 1.72 * 10^-8 Ohm*m²/m at 20 degrees C. The temp
coefficient of resistivity is .00393 at 20 degrees C but using this I
get a result of around 5.31 at 540 degrees. But a problem I am solving
says it is closer to 4.30. I am having trouble resolving the difference.
Can anyone confirm the (approx.) 4.3 number for me?
Thanks for any help.
Doug Brooks
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