Silicon, Circuits, and the Digital Revolution

 
Resistivity and Play-Doh

A power supply is used to drive a current through various cylinders of Play-Doh. By using an ammeter and voltmeter as shown, the resistance of a given length of Play-Doh can be determined. This configuration is used rather than a simple ohmmeter to avoid problems with contact resistance -- the Play-Doh tends to "break down" at the one contact!

 
Good Sample Preparation and Technique   Questionable Sample Preparation!


SCEN103 Comments, suggestions, or requests to ghw@udel.edu.
"http://www.physics.udel.edu/~watson/scen103/colloq2000/problems/playdohphotos.html"
Last updated March 8, 2000.
© George Watson, Univ. of Delaware, 2000.