A1 - 830 USB loading too weak to support its use?

My Tablet goes dead when I play games while it is connected to my laptop to charge via usb, because apparently it is not getting enough energy to spare. When the Tablet is attached to the tht of transformator usb is plugged into a 220 outlet it seems its ok...
My question is - is this normal?
To me, it seems illogical since current usb should b the same.

PC/laptop USB: 5V 0, 5Ah (international standard)

Charger AC/DC: 5V 1Ah (you can find Chargers until 2Ah)

You can easily understand that you have more ampere hour (Ah) using the AC charger.

Ampere:

http://en.Wikipedia.org/wiki/ampere

So it's normal.

Tags: Acer

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