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usb charger power rating?
on a usb ac charger adapter (the ones that are used for phones, cameras, etc.) what is the most important spec for power output? i've seen straight watt labels, like 10w, then others like 9v at 1.2 amps. the equation for watts is w/va, so is 9v, 1.2a charger 10.8w? thanks in advance!
1 Answer
- ?Lv 71 year ago
Output voltage is most important.
USB is 5v. Current rating ranges from 500mah to 2400mah
Any 9v usb charger is for quick charging and is only to be used with supported devices unless its both 9 and 5 volt. Quick Charging devices can use both voltage chargers.
