Thermal Coefficient Of Resistance In Copper

Purpose

To show that the resistance of copper changes linearly with temperature.
 

Equipment

Mounted copper coil, liquid nitrogen, dry ice and methanol, digital ohmmeter, video camera with monitor, and blank overhead transparency graph with overhead projector. ◙

 

Setup Time

15 min.
 

    Images

    k5-34

    Description

    Measure the resistance of the copper coil at room temperature (295K), at the temperature of a dry ice and methanol mixture (195K), and at the temperature of liquid nitrogen (77K). Plot resistance versus temperature to demonstrate the linearity.