Homework Help: Engineering Science (Physics)

Posted by Xyler on Wednesday, March 14, 2012 at 4:26pm.

A platinum coil has a resistance of 3.146(ohms) at 40'C and 3.767(ohms) at 100'C. Find the resistance and the temperature coefficient of resistance at 0'C. Thanks in anticipation

Engineering Science (Physics) - Henry, Thursday, March 15, 2012 at 5:03pm
A. R = Ro + a(T-To)Ro.
3.146 + a(100-40)3.146 = 3.767.
3.146 + 188.8a = 3.767.
188.8a = 3.767 - 3.146 = 0.621.
a = 0.621 / 188.8 = 0.003289. = Temp, coerfficient.

B. R = 3.146 + 0.003289(0-40)3.146.
R = 3.146 - 0.4139=2.732 Ohms @ o Deg.
Engineering Science (Physics) - Xyler, Thursday, March 15, 2012 at 6:03pm
Thanx Henry I really appreciate ur effort soo much.. May God Bless U..

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