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There is a toy called shock box, where when opened it delivers a shock. It delivers a shock when opened because the circuit is broken, appareantly similarly to a how a car is started. This toy is powered by a 9 volt battery and two grouos of looped copper wires (about 1:15 ratio). You may notice i am not very knowledgable in the field of electromagnetism, so here is a video of how it is built to better explain it: https://youtu.be/0Z37iZDx63w

My question is, what is the theory behind how this works?

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    \$\begingroup\$ Theory: \$V = L\dfrac{di}{dt}\$ or Faraday's law of induction. I didn't watch the video BTW. \$\endgroup\$
    – Andy aka
    Jan 12 at 11:18
  • \$\begingroup\$ The video you have linked is nothing to do with electric shocks. \$\endgroup\$
    – HandyHowie
    Jan 12 at 11:26
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    \$\begingroup\$ The video is of a vibration box, not a shock box. \$\endgroup\$
    – JRE
    Jan 12 at 11:26
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The device in the video does not literally deliver an electrical shock. It is merely a vibrator (a DC motor with an eccentric mass attached to the shaft) wired in series with a N.C. microswitch contact and a battery.

It’s possible to make a very simple electromechanical circuit to literally shock people, but I don’t think that’s very funny so I won’t bother showing it.

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    \$\begingroup\$ I don’t think that’s very funny so I won’t bother showing it. this. \$\endgroup\$ Jan 12 at 13:51

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