Home » Questions » Computers [ Ask a new question ]

Is it safe to plug USB devices on 220v wall sockets?

Is it safe to plug USB devices on 220v wall sockets?

I have an ipod touch and since then I've been charging it on the PC via USB. I just want to know if it is safe to use those wall socket chargers for USB devices? Is it different on every device, or is it safe to use it on any USB device?

Asked by: Guest | Views: 21
Total answers/comments: 2
Guest [Entry]

"I just want to know if it is safe to
use those wall socket chargers for USB
devices?

Short answer: Yes

Long answer:

The usb spec tells us Vbus = 5VDC, and then the device can start with 0.1A (but the device ""can ask"" for as much as 0.5A).

The wall socked should transform 220VAC into 5VDC.

Please note that a lot of those wall sockets that short-circuit D+ and D- and then you don't have to negotiate how much current you can draw (and as much as 1A should be ok).

If you are unsure, just use a multimeter and check that the wall socket provides 5VDC.

Good luck."
Guest [Entry]

"works for me. Probably you should check your device for 110-240 (or 220) written on it. Those tiny USB adapters that came with my iPhone in the US, work fine in Europe... I just need an adapter plug to be able to plug it into the socket.

Also I brought over from the states a Belkin ""thing"". dunno how to describe it, it is kind of like a brick with a bunch of power sockets. So like a mini powerbar, but with 2 usb ports also. That also works in Europe to power my iPhone dock and iPhone/iPod universal docks. After I plug it into the wall with a plug adapter."