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AC Capacitor: A Water Tank Analogy

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In this animated lesson, students read an analogy comparing water in a "special" water tank to the current "flow" through a capacitor.

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Posted by Mehran Tahir on 10/6/2015 9:51:26 AM Votes 0.00 Thumps Up Thumps Down

I am designing a capacitive sensor. Which is based on a capacitive voltage divider. And i have a time constant arround 1000 sec. To increase the time constant of my sensor i am looking for a capacitor. As the insulation resistance of my sensor is arround 1000Tohm. So I am looking for a capacitor of 1000PF and 1000Tohm or with even higher insulation resistance. but I donot really know that which type (ceramic or film) of capacitors have high insulation resistance. As I films like PTFE has high surface resistance arround 10^18 ohm. so I thought that PTFE film capacitors could be the best option. But I could only found capacitor in ther rang of max 10Gohm. Can anybody tell me if someone have some experience using such capacitors. That is it possible to get a capacitor with such high resistance ?

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Excellent simple illustration of how capacitor works , Good Job !

Posted by Ramy Fouad on 2/5/2013 5:52:53 AM Reply

This is a lovely anaolgy that I would be very happy to share with my students and collgues.

Posted by Satya Sarada Kandula on 11/24/2006 12:00:00 AM Reply

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