铝、铜等金属电阻率电导率随温度变化公式系数ZZ 电阻率电导率单位换算

此文章转自Simwe论坛Ansoft版主Perch88博客,很有用故转载,英文原文来自:http://www.ndt-ed.org/EducationResources/CommunityCollege/Materials/Physical_Chemical/Electrical.htm

在2个温度下,电阻和电阻率的关系如下:R1 = R2 * [1 + a *(T1–T2)]
其中的温度系数a请按原文中表(本文最后)查询:
举例:
问题:25oC电阻率是2.706 x10-8 a = 0.0043/oC,请问20 oC时的电阻率是多少?

答案:R1 = R2 * [1 + a *(T1–T2)]

把下列参数带入上式:
R2 = 2.706 x 10-8 ohm meters (measuredresistivity at 25 oC)
a= 0.0043/ oC
T1 = 20 oC
T2 = 25 oC

得到:

R1 = 2.706 x 10-8ohm meters * [1 + 0.0043/oC * (20 oC – 25 oC)]

= 2.648 x10-8ohm 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, thetemperature coefficient is the same for conductivity and theequation requires only slight modification. The equationbecomes:

s1 = s2 / [1 + a *(T1–T2)]

Where: s1 = conductivity value adjusted toT1
s2 = conductivity value known or measured at temperatureT2
a = Temperature Coefficient
T1 = Temperature at which conductivity value needs to beknown
铝、铜等金属电阻率电导率随温度变化公式系数ZZ 电阻率电导率单位换算
T2 = Temperature at which known or measured value wasobtained

MaterialTemperature Coefficient (/ oC)
Nickel0.0059
Iron0.0060
Molybdenum0.0046
Tungsten0.0044
Aluminum0.0043
Copper0.0040
Silver0.0038
Platinum0.0038
Gold0.0037
Zinc0.0038

  

爱华网本文地址 » http://www.413yy.cn/a/25101010/32126.html

更多阅读

餐饮管理 云海肴:与客人互动让等位流失率降低到10%以下

云海肴是一家北京火爆的云南餐厅,目前已有十家店,几乎每家店在就餐高峰期,都会排起长长的等位大队。因为云海肴餐厅多开在商超内,周围都是餐饮旺店,客人的选择面很大,怎样让等位的客人不流失?云海肴人集思广益,想出了许多办法,既可以让客人

声明:《铝、铜等金属电阻率电导率随温度变化公式系数ZZ 电阻率电导率单位换算》为网友回忆那份伤分享!如侵犯到您的合法权益请联系我们删除