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Activities/Turtle Art/Using Turtle Art Sensors (view source)

Revision as of 00:34, 8 November 2010

343 bytes added , 00:34, 8 November 2010

→‎Measuring Water Salinity

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[[File:Conductivity rainwater graph.jpg]]

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The graph shows first an unconnected circuit (14k ohms) then the circuit is connected. Note how the resistance slowly rises. The terminals are reversed mid screen, the sudden dip and gradual rise are more pronounced. Why is this? Electrolysis products (microscopic bubbles of hydrogen and oxygen for pure water) build up near the electrodes.

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