Comment by userbinator
2 days ago
Really feels unsafe, but neither me nor the computer have suffered any serious injuries yet.
That's due to interference suppression capacitor in the PSU. The safety standard puts the "touch current" limit at something like 300uA (0.3mA), which is definitely in "painful but not dangerous" territory. You do need to exercise caution when plugging in other devices that are also connected to the mains, since that amount of current and voltage can certainly damage sensitive electronics.
Old but good page on such measurements: http://www.aplomb.nl/SMPS_leakage/Doc_ie.html
> since that amount of current and voltage can certainly damage sensitive electronics
Like for instance the magic mouse. I've completely destroyed three magic mice by sometimes accidentally touching the mouse to the laptop. It'd not do much of anything initially, but at some point touching them together would kill the connection for a couple seconds, and over time it evolved into the mouse just refusing to connect altogether.
I'm glad my boss pays for this hardware because I'd be incensed to have a mouse THAT expensive break that quickly.