THIS DEMONSTRATION IS CURRENTLY UNAVAILABLE

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

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.

SUGGESTIONS:

REFERENCES: (PIRA unknown.)

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.