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!

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Last updated March 8, 2000.
© George Watson, Univ. of Delaware, 2000.