Asked by poojathally | 22nd Feb, 2010, 12:59: PM
For pure metals, this coefficient is a positive number, meaning that resistance increases with increasing temperature. For the elements carbon, silicon, and germanium, this coefficient is a negative number, meaning that resistance decreases with increasing temperature. For some metal alloys, the temperature coefficient of resistance is very close to zero , meaning that the resistance hardly changes at all with variations in temperature.
Manganin ------- Alloy ------------ +/- 0.000015
Constantan ----- Alloy --------------- -0.000074
Hope this helps.
Answered by | 22nd Feb, 2010, 01:25: PM
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