Science Experiments Kids   Science Fair Projects
  1000 Science Fair Projects Com
   
Seebeck Effect

Abstract

The objective: The Seebeck effect is the generation of electrical potential when strips of two dissimilar metals are connected to each other, where the two junctions of the metals are at different temperature. In this experiment, the potential was measured when nickel, tungsten, copper, silver, and Alumel (5% Al, 95% Ni) are paired with Chromel (10% Cr, 90% Ni) and steel at 0 and 100 deg C. It is hypothesized that metals with the largest difference in ionization energy between the metal and Chromel or steel will generate the largest potentials. Because nickel has the lowest ionization energy of the metals we measured, we expect it to generate the largest number of microvolts, and therefore to be the best thermocouple material.

Methods/Materials

The thermocouples were submerged in boiling water and ice water, and the resulting voltage was measured using a voltmeter. (Actually, a Fluke 87 Multimeter and a Fluke 80TK Thermocouple Module was used to read the temperature in degrees C, which we converted to voltage.)

Results

The results demonstrate that Nickel wire coupled with Chromel generated the largest potential, followed by Alumel, silver, copper, and finally tungsten.

Conclusions/Discussion

In thermoelectrics there is something called a Seebeck Coefficent. The Seebeck Coefficent is the thermoelectric sensitivity of each metal. Ionization energies are directly linked with Seebeck Coefficents. The larger the difference between the Seebeck Coefficients of the paired metals, the higher the voltage. Our results are consistent with what is predicted by Seebecks theory.

Finding the best metal to create a voltage when paired with either steel or chromel in a thermocouple.

Science Fair Project done By Joanna Estrada

 

Related Projects : The Focalization of Sound, Specific Heat in Materials, Quantifying the Effect of Tungsten,Color vs. Heat Absorption, Wavelength Controlled Holographic Polarization, Swing, Pendulum, Swing, Creating Sound with Heat, How Do Various Nonwoven Medical Gowns Compare as Barriers Against UV Radiation, Chemiluminescence, Effect of Ammonia Gas on Copper Nanowire Sensors, Brass Instruments and Artificial Lips, How Accurate Is Parallax, Doppler Effect and the Fiber Gyroscope, Radioactive Attenuation and the Inverse Square Law, Effect of Color on the Characteristics of a Heat Barrier Material

 

<<Back To Topics Page........................................................................................>> Next Topic

 

 

Copyright © 1000sciencefairprojects.com 2012 through 2014