A SIMPLE METHOD FOR MEASURING THE TEMPERATURE COEFFICIENT OF ELECTRICAL RESISTANCE OF METALS

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  • 電気抵抗の温度係数の簡単な測定法

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<p>The electrical resistance of most metals increases linearly as the temperature rises. At the high school level, this phenomenon may be explained qualitatively using the classical electron model of conduction in metals, which contains the concepts of atom and heat. Because of the electron model, the experiment measuring the temperature coefficient of resistance, α, must be one of good teaching materials. The present paper describes a newly devised method for measuring the temperature coefficient of resistance. The advantages of the method are summarized as follows: (1) The proportional relation between resistance and temperature is directly shown without any calculation. (2) The value of α is given using a simple expression. (3) The relative error of the measured values of α to the known values is within 2-3%. (4) The time required in measurement is about 20 minutes. Hence, it is possible to finish the experiment in a class of 50 minutes. (5) The experimental apparatus, which was made on the basis of the devised method, needs only the connection of a sample of resistance and a dc voltmeter. Besides, its operation is very easy.</p>

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