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Light from a 10F Capacitor charge/discharge
Should be able to plot rotation frequency as a function of voltage at some point, just now I wanted to find a way to show students that what they see (i.e. that the motor runs on the charged capacitor until it stops) can be visualised with a graph that looks similar to the graphs in their books.

So it just has to look like an exponential decay.

What was quite interesting is that the frequency measurement probably picked up different harmonics of the vibration. I was holding phone and everything in my hands, so I probably damped the vibrations differently while "measuring".

Didn't try the light sensor idea yet since the 5 "lab-phones" I have don't have light sensors (SM-J500FN).

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RE: Light from a 10F Capacitor charge/discharge - by Erik Josefsson - 12-14-2021, 07:21 AM

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