I've never had this happen with a laptop but as a musician I've been zapped by a microphone a bunch... not an infrequent occurrence if you play electric guitar and sing at the same time. Twice in the past year I've been hit during soundcheck at a gig because of bad grounding at a venue. Last time my solution was to plug everything into the same outlet via a power strip but I invariably end up off-kilter for a few minutes after being electrocuted through my mouth as I'm about to play :-(
This also happens with iPhones. And under the right circumstances you can feel the same tingling sensation on skin contact as well if the other person is holding a plugged in iPhone.
They didn't. The one that's ungrounded is a plastic pin. It's just there because the UK plugs require it to mechanically open the live and neutral connections, allowing you to actually plug the thing.
I have no expertise in this: but it could be one of the cells in the battery is performing worse than the rest. The way charging works in a pack is that it measures all 4 cells for instance, and if one is higher than the others it discharges that one only, then continues on charging them all at once, then periodically checks again
I get this sometimes, but not all of the time on my newish (6 month) Asus 14 laptop with a UK 3-pin to mains power supply. And I've had it with other laptops in the UK. It's mysterious, but don't think it is going to kill you.
Sure, but DC relative to what? Can't be ground since that connection isn't there, so that leaves neutral.
I've got half an alligator clip on my workbench, the other half disappeared when I connected it to the floating ground of a 5VDC system. It just so happens the ground was floating on top of 120VAC. The ATmega didn't care, it only ever saw 5V between its Vcc and Vee, however once I made the mistaken of connecting its "ground" to an actual ground sparks flew.
The DC side is fully isolated except through a capacitor that is there to reduce EMI interference and is specifically built to "fail safe", except for the cheapest no-name imported power supplies. (https://www.pcbaaa.com/y1-capacitors-function-application-an...)
That's not what the Y capacitor is doing here. All Y means is "high voltage withstand, will fail open, and we have receipts". Here, it's not line-to-ground, but primary-to-secondary.
You'd use X for L to L/N, Y is for N to Ground. Those isolated power supplies are definitley grounded, definitely not what Apple is using, and will probably shut themselves off if they lose their ground connection (or at least signal a fault to the operator)
You're also confusing the Y designation, which relates to the capacitor properties, to the application. Not all Y capacitors are used for line-to-ground applications. However any application where a failure to a closed state would result in a shock hazard must use Y-rated capacitors.
Neither is the output of an isolated power supply. That's the whole point. There is an enormous amount of resistance between the output side and the household wiring in the input side, just like the battery scenario. The difference between gigaohms (like you might see in between the windings of the SMPS transformer) and exaohms or whatever the airgap between the battery and the nearest outlet is is negligible for any practical purposes.
You may see AC leakage due to the capacitance between the windings and also that of the Y capacitor (this leakage is the source of the sensation in the article), but that's also tiny and it won't be blowing up any crocodile clips. If you did have that happen, your power supply wasn't isolated somehow.
So, what's that? And how to know, in the UK, if I have it, or don't want it. Because I have had the same throbbing experience with several metal shell laptops plugged in to power in at least three houses in the UK.
I'm not familiar with the UK wiring standards. However an easy first step that I would imagine also applies there is losing the bonding jumper between neutral and ground at the main circuit breaker panel.
In Canada and USA with our split phase residential system a decent next step is to overload 1 phase causing the neutral to start drifting from 0V.
In the UK with single phase supply I imagine the next best thing would be to also break the neutral return to the pole which should generate at least 100V on the neutral (and also stop all appliances from working), fortunately for you (I think) the UK mandates GFCIs (RCDs) on all residential circuits which would also prevent that from actually killing you.
In summary, I'm going to guess that touching neutral in the UK is a healthier past time then it is in the US or CA. Still not healthy, but at least healthier.
There are a series of things that can be wrong both with the hardware you plug in and with the plug itself. Things can straight up be wired in the wrong order, grounding can be done incorrectly so there's more than one path to ground which among other things causes there to be a voltage difference between the neutral wire and the ground wire, corrosion or bad connections can cause similar issues.
The first cheap test you can do is buy one of these plug testers that diagnose some of the more direct problems you could be having for about £10, don't necessarily buy the one I linked, but do a little research and pick something that seems right.
If you're having those kinds of problems, it wouldn't hurt to contact a local electrician and quickly describe the issue and ask what it would cost to diagnose.
Well, it is not so much of a problem as just strange. I have had my brother, who knows a bit about power circuits, do some testing on my current house, and it seems OK. But sometimes, and only sometimes, metal shell things plugged into the UK mains via 3-pin UK plugs will do the throbbing stuff. And as I said, this happened in multiple houses, with multiple PSUs and laptops and other stuff.
i have had this issue and realized i was basically getting a low key elec shock every time i had the power plugged into my mac; turned out it was the apple wall wart power brick; using a different one ended the constant elec pulse shocking effect. (at first i thought it was the shitty fraying usb-c cables apple provides which turn yellow and the plastic breaks apart after 6months to a year - nope! that thing is fine).
https://www.reddit.com/r/AskElectronics/wiki/why#wiki_tingli...