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Play-Doh:
Length Dependence of Resistance:

The resulting values of voltage across various lengths of a Play-Doh
cylinder are given below.
Note that the values of current through the Play-Doh are constant.
Corresponding values of resistance are calculated using Ohm's law.

(meas) (meas) (meas) (calc)
Length Voltage Current Resistance
(cm) (V) (A) (ohm)
2 0.98 0.158 6.2
4 2.12 0.162 13.1
6 3.35 0.164 20.4
8 4.46 0.164 27.2
10 5.76 0.165 34.9

*Data taken 2/27/96.*

The **linear dependence of resistance on length** is evident from the graph.
(Note: the uncertainty in length can be assumed to be 2 mm and the uncertainty
in resistance is around 2%.)

"http://www.physics.udel.edu/~watson/scen103/playdo1.html"

Last updated Sept. 26, 1996.

Copyright George Watson, Univ. of Delaware, 1996.