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in this video at 4min 4sec https://youtu.be/CkGVMWK10qU?t=243 The guy receive a shock of a taser by touching a metal object that touches one probe, but why does the arc goes through his body ? I know that there must be an electric potential difference in order to have current flowing through the body, so where is the second potential ? At first I though it was the ground he touches with his feets but his contraption runs on a drill battery and it looks like it is on a wooden table. Any help ?

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He still touches button with its contacts by the other hand. That button is residing in the low voltage circuit, which is connected to the ground. Circuit diagram is at 3:28 of the video.

And finally, arc is going to find the "shortest" way to get through to the ground; the resistance of the body is much less than resistance of the air, even if it looks like physical distance between contacts is much less than distance between his fingers of the right and left hand. So it is fairly logical that it diverted to him rather than continuing going through the air between the contacts.

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  • \$\begingroup\$ I didn't think about that thank you ! So for exemple if he is used a wooden stick with a resitance higher than the resistance of the air between the 2 probes there is no way the arc jump across his body ? \$\endgroup\$ – Guigui Dec 15 '18 at 22:51
  • \$\begingroup\$ Anything can be considered as wire. Air is also a kind of special "wire" which conducts current under specific circumstances. Wooden stick is also a "wire", and there's no guarantee current will not divert through it. The high voltage contacts must be isolated from the parts they should not relate to - like it is done in the car using rubber isolation materials and high voltages going to the car candles without any other exposure. \$\endgroup\$ – Anonymous Dec 15 '18 at 23:05
  • \$\begingroup\$ I don't think wood has higher resistance than air. \$\endgroup\$ – Jasen Dec 15 '18 at 23:42
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    \$\begingroup\$ @Jasen you'd be wrong. Dry wood can have higher resistance than air, for both it depends a lot on the amount of moisture. \$\endgroup\$ – Chris Stratton Dec 15 '18 at 23:51
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Even if the guy keeps the other hand in his pocket, and stands on a thick dry insulating mat, there is capacitance between the bottoms of his feet and the underlying floor. Assume hundreds of picoFarads. That has to become charged.

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  • \$\begingroup\$ Does this capacity exsits only if the low voltage/ground of the circuit is somehow connect to/near/(also has a capacity with) the floor ? Because if it's really far from the floor how can a capacity exist if there is no closed loop ? \$\endgroup\$ – Guigui Dec 16 '18 at 12:40
  • \$\begingroup\$ Electric fields are everywhere. Nature uses all possible paths in storing energy. The fields are stored energy. You may have TWO capacitors in series, because Nature exploits that, to store additional energy. \$\endgroup\$ – analogsystemsrf Dec 18 '18 at 4:09

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