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In a capacitor (the part of the CRT that stores charge) current is I(t)=C (dV(t)/dt). In most CRTs the C is low enough to be reasonably safe. I've discharged freshly powered off CRTs with my body a couple of times....Hurts for a few seconds, some colorful language is emitted and sometimes reflexes are triggered, but nothing worse.
Capacitors and low current power supplies rarely come close to living up to the simplest form of ohm's law...
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