A wire has a resistance of 10.0 ohms at 20.00c and 13.1 ohms at 1000c. Obtain a value for its temperature coefficient of resistance.
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Expert's answer
2018-02-26T09:27:07-0500
The temperature dependence of a wire resistance is given by equation R(t)=R_0 (1+αt) So R(t_1 )=R_0 (1+αt_1 ) R(t_2 )=R_0 (1+αt_2 ) These equations give α=(R(t_2 )-R(t_1 ))/(t_2 R(t_1 )-t_1 R(t_2 ) ) α=(13.1-10)/(100×10-20×13.1)=0.0042 1/℃ Answer: 0.0042 1/℃
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