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What happens if I charged a capacitor then i touch the 2 poles in same time?

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If the charge in the capacitor is large enough, you'll get a nice little shock:-), as the capacitor will discharge through you. I remember grabbing a rectifying valve disconnected from the mains a long time ago - that was not pretty (apparently, it contained a capacitor). I was "clever" enough to grab it again:-)

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I've had the misfortune of doing that with a large capacitor of the sort used in power supplies back in the vacuum tube (valve) days. It not only caused a small burn, but knocked me over. –  Paul J. Gans Dec 1 '12 at 2:19

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