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High Voltage Pendulum

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Uploaded by on May 20, 2008

This is a video of a HV pendulum. How it works is that one soda can is charged up to a high positive potential and the other is at a low potential compared with the other. The metal ring in the middle, which is neutral at first is attracted to the positive can on the left. Once the ring touches the can it is charged up to the same potential as the can and thus is now attracted to can with the lower potential or more negative voltage. Once the ring touches the can on the right it has now discharged all of its potential and thus is neutral again and is attracted to the can on the left, which now has a higher potential than the ring. This makes the ring swing back and forth creating a pendulum motion. To make this work I connected one can to ground(right can) and one to the output of my C&W voltage multiplier(left can). I would imagine the potential between the two can's is around 40-60kV, but I'm not completely sure. As you can see the ring swings nicely until I discharge the left can to ground and then it suddenly stops swinging. It will go for over 5 minutes on one charge. I just flick the multiplier on for less than a second and they turn it off to charge up the soda can. It could probably swing for longer if I had a better bearing on the ring so that it could swing more freely. Enjoy!

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Science & Technology

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Uploader Comments (Sparrow338)

  • whith what voltages are you working?

  • Might want to try reading the video description...

    40-60kilovolts

  • This is a demonstration of something called "Franklin's Bells" - a device invented by Benjamin Franklin to detect the presence of lightning. Generally, one can (well, bell) would be grounded, the other would be hooked to an arial (antenna). Voltage from the atmosphere builds up on the 2nd can/bell, attracts the hammer - which then is charged, and repelled, and attracted to the grounded bell. Simple but fascinating storm detector.

  • Yep!

Top Comments

  • you can annoy the shit out of some1 with this noise...lol..just leave it on...hahha

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All Comments (18)

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  • It is called Franklin's Balls... lol

  • Thumbs up if you want cola now :P

  • me:*turns on pendelum*

    bro:WHAT THE FUCK IS THAT NOISE!?*touches it*

  • Like if watch this because u were bored

  • wife: wtf are you doing with our wedding ring?

  • @UKTV2UTUBE I would if it will work withs other makes of coke tins, just kidding This is good work

  • Sounds like it's saying coke can, coke can, coke can, coke can, coke can, coke can, coke can, coke can, coke can, coke can

  • thats like my ionic oscillator!

  • knock, knock, knock, knock, knock, knock, knock, knock, knock is there any coke in there?

  • Good annoying alarm system .. I won't be late to work any more

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