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2009年普通高等学校招生全国统一考试理科综合能力测试Ⅰ卷第24题为:材料的电阻率ρ随温度变化的规律为ρ=ρ0(1+αt),其α称为电阻温度系数,ρ0是材料在t=0℃时的电阻率。在一定温度范围内α是与温度无关的常量。金属的电阻一般随
2009 General College Entrance Examination national comprehensive ability test Ⅰ volume twenty-fourth Question: material resistivity ρ changes with temperature law ρ = ρ0 (1 + αt), the α is called the temperature coefficient of resistance, ρ0 is Resistivity of the material at t = 0 ° C. In a certain temperature range α is temperature-independent constant. Metal resistance generally follow