On Fri, 2012-11-16 at 22:03 +0000, Geoff wrote:



> In winter it can be near 400Ohms and in
> summer about 440 or 450. Maybe someone
> can point me to a formula for copper wire
> which converts temp to resistance.

Cu has a TC of 3930 ppm / C (or .393 % / C).  A 10% change (as in your
example) from 400 to 440 ohms, would result from a 25 C temperature
rise.

http://www.cirris.com/testing/temperature/copper.html
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/restmp.html


-- 
==================================================================
Bob Smither                                        Bob@...........

  "We make money the old fashioned way.  We print it."
   --Art Rolnick, Chief Economist, Minnepolis Federal Reserve Bank
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