A carbon resistor is to be used as a thermometer. On a winter day when the tempe

Question

A carbon resistor is to be used as a thermometer. On a winter day when the temperature is 4.00?C, the resistance of the carbon resistor is 217.7? . What is the temperature on a spring day when the resistance is 215.9? ? Take the temperature coefficient of resistivity for carbon to be ? = ?5.00 A carbon resistor is to be used as a thermometer. On a winter day when the temperature is 4.00?C, the resistance of the carbon resistor is 217.7? . What is the temperature on a spring day when the resistance is 215.9? ? Take the temperature coefficient of resistivity for carbon to be ? = ?5.00

Explanation / Answer

R = R0 * ( 1 + alpha*deltaT)

=> 215.9 = 217.7 * ( 1 - 5*10^-4*(T -4))

=> T = 20.46 degC

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