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I have a device that charges via a USB connection. Can you also connect that USB cord to AC adapter and charge it safely?

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  • \$\begingroup\$ It would be nice if you could clarify what the devices you mention are. "AC adapter" is pretty unclear. \$\endgroup\$
    – Wesley Lee
    Commented May 20, 2020 at 22:23

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If your adapter outputs 5v DC then yes, but in that case it's a bit more than a physical adapter. Under no circumstances can a USB device be connected to an AC source without first converting the AC source to DC and regulating the voltage to 5v (assuming USB 2.0/3.0 -- USB C and the 3.1/3.2 standards allow for higher voltage if proper components are on both sides. )

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