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My laptop adapter is ungrounded, and because of that, I feel slight vibrations when I stroke the laptop surface (if I unplug my laptop, the vibrations go away, so it can't be the fan). The adapter is double-insulated so it should be perfectly safe without grounding - but those vibrations are still worrying me. It might be electricity that's passed to me, but I'm not sure what it really is. What are those vibrations, and are they harmful for me or my laptop?
@Dave ungrounded, not underground. – user619691 – 2016-07-21T07:57:53.707
Arrghhhh, dyslexia, you win again :S – Dave – 2016-07-21T07:59:46.417
1It's probably cooler fan not adapter. – conquistador – 2016-07-21T08:06:03.527
@MustafaAKTAŞ It definitely isn't, because when I unplug my laptop, it's gone. I'll edit my question. – user619691 – 2016-07-21T08:20:30.307
I have the same problem with my iPhone and various laptops (only on the metal/aluminum parts). I have yet to figure out how to solve it... – Bitten Fleax – 2016-07-21T08:29:22.393
It sounds like a bit of stray voltage on your laptop. I wouldn't be worried about it since the power coming out of the adapter is usually around 20 volts for laptops, so it's harmless. I don't know if this is a malfunction or something normal. You might want to try another adaptor. – None – 2016-07-21T08:39:55.597
I had a metal lamp stand that did the same thing, when you stroke your finder against the surface some weird kind of vibrations occurred. Not sure why but the frequency could be 60 Hz, like the wall outlet. I don't think it's dangerous. – Jonatan Öström – 2016-07-21T10:13:41.913
Please see http://apple.stackexchange.com/questions/72566/shocking-macbook-stubby-earthed-charger-uk/193509#193509
– Tetsujin – 2016-07-21T14:53:50.733