Eg-2 Temperature Dependence of Resistance
Published: Tuesday 14 March 2006 - Updated: Tuesday 29 March 2011
Aim
To demonstrate that the resistance of a copper wire depends on the temperature.
Apparatus
- Liquid Nitrogen
- Dewar Flask
- 0-14V DC Power Supply
- Resistance coil apparatus
Diagrams
Click on pictures to enlarge.
|
Temp Dependence of Resistance Pic 2 |
Temp Dependence of Resistance Pic 1 |
Description
A coil of wire wound on a copper former is connected to a small light globe. The voltage on the power supply is adjusted till the globe glows dimly. If the copper tube is immersed in a Dewer of liquid Nitrogen the resulting change in resistance causes the globe to glow brightly.