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Thermal Coefficient of Resistance

A 1.70 m cylindrical rod of diameter 0.450 cm is connected to a power supply that maintains a constant potential difference of 15.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0 degree Celsius ) the ammeter reads 18.7A , while at 92.0 degree Celsius it reads 17.2 A . You can ignore any thermal expansion of the rod.

Find the resistivity for the material of the rod at 20 degree celsius.

p= _______ ohms m.

Find the temperature coefficient of resistivity at 20 deg. Celsius for the material of the rod.

X = _______ deg C^-1.

What is the resistance of a Nichrome wire at 0.0 deg. Celsius if its resistance is 180.00 ohms at 11.5 deg. Celsius? Temperature coefficient for Nichrome is .0004

R= ________ ohms.

What is the resistance of a carbon rod at 25.8 deg Celsius if the resistance is 0.0140 ohms at 0.0 deg. Celsius? Temperature coefficient for carbon is -.0005

R = _________ ohms.

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