Voltmeters, Ammeters and Null Measurements
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The role of the adjustable resistor is crucial because it needs to be "tuned" just right to make the galvanometer show a null reading (zero voltage). Watch this video, which recaps this information. The discussion also includes the Wheatstone bridge, a setup that is used to measure resistances instead of voltages, using the same idea of making a null measurement.
Source: Greg Clements, https://youtu.be/LiDtD4BXrKA
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Last modified: Tuesday, 9 July 2024, 3:35 PM