Equipotential Lines

Two electrodes in water are connected to a constant-voltage source. A probe is connected to a multimeter. As the probe is moved around in the water, the multimeter shows the electric potential of the water at the probe tip relative to one of the electrodes.

To use the movie, open it in video analysis software. Choose a potential, such as 3 Volts. As you step through the video frame-by-frame, mark a point on the probe tip each time the multimeter reads 3 V. These marked points lie along the 3 V equipotential line.


To download a movie, right-click on the link and choose "Save Link as...":

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This material is based in part upon work supported by National Science Foundation (NSF) grants 0089380, 0424063, 0717699 and 1122828. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.