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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Kent
Post subject: Copper wire resistance
Unread postPosted: Thu Dec 23, 2004 11:10 am

We are working on a new electronic sensor device which requires the
periodic measurement of a 28AWG kynar insulated copper wire loop
(ten feet long) under varying ambient temperatures.

Since the electrical resisitivity of copper increases linearly with the
ambient temperature, we know the following facts about copper
wire at a temperature of 20C:

10.09 (ohm-cmil/ft) 1.678 (micro-ohm-cm)


Our problem is that we need to know the electrical resisitivity of copper
wire at each degree reading between -20C and +70C ( in addition to
the electrical resisitivity we know that copper has at 20C).

If anyone has a suggestion or reference for further information, please
advise as soon as possible.

Thanks in advance for your help in this matter.



Posted  11/12/2012
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