材料的电导率和电阻率与温度的关系
电阻和电阻率的关系如下：R1 = R2 *问题：25摄氏度，电阻率是2.706 x 10-8a = 0.0043/ oC，请问20 oC时的电阻率是多少?
答案：R1 = R2 *
把下列参数带入上式：
R2 = 2.706 x 10-8 ohm meters (measured resistivity at 25 oC)
a = 0.0043/ oC
T1 = 20 oC
T2 = 25 oC
得到：
R1 = 2.706 x 10-8ohm meters *
= 2.648 x 10-8ohm meters
可以看出，温度越低，电阻率也就越低。或者说，温度越高，导体的导电性就越差，电阻就越大，通过相同电流时，损耗（一般导线材料是铜，因此也叫铜损）也就越大，这是在很多涉及到导线的设计时都需要考虑的问题。
Since conductivity is simply the inverse of resistivity, the temperature coefficient is the same for conductivity and the equation requires only slight modification. The equation becomes:
s1 = s2 /
Where: s1 = conductivity value adjusted to T1
s2 = conductivity value known or measured at temperature T2
a = Temperature Coefficient
T1 = Temperature at which conductivity value needs to be known
T2 = Temperature at which known or measured value was obtained
Material
Temperature Coefficient (/ oC)
Nickel 0.0059
Iron 0.0060
Molybdenum 0.0046
Tungsten 0.0044
Aluminum 0.0043
Copper 0.0040
Silver 0.0038
Platinum 0.0038
Gold 0.0037
Zinc 0.0038
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