SCEN103 9/26 Class
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Resistivity and Play-Doh
Results of previous group activities
- Voltmeters and Ammeters
- A voltmeter measures voltage across a circuit element;
-- therefore it must be connected in parallel with it.
- Voltmeters must have a much higher resistance than the element;
-- otherwise voltage will change significantly.
Consider effective resistance.
- An ammeter measures current through a circuit element;
-- therefore it must be connected in series with it.
- Ammeters must have a much lower resistance than the element;
-- otherwise current may change significantly.
Again, consider effective resistance.
- Resistance of a cylinder of Play-Doh -- DEMO
- Dependence on length
- Results: Graph
Resistance is directly proportional to the length
of a cylindrical resistor.
From the Play-Doh Page
More online Play-Doh resources:
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Last updated Nov. 12, 1996.
Copyright George Watson, Univ. of Delaware, 1996.