This is a discussion on Usb charging within the iPad 2 Forum forums, part of the Apple iPad Discussions category; Originally Posted by KJSmitty Originally Posted by DontUnderstandMyIpad Have you connected the USB cable to a pc/laptop? The iPad draws a current of 10A and ...
Actual current flow varies with the charge level required. If charge is really low, then the demand current wise is higher. As the charge reaches full, the current tapers off so as to not over charge. That is the regulators job. I know too much detail.
No need to double check my specs. I already knew them as stated. Maybe you would have preferred "up to 1A".Originally Posted by madhatter61
The only point worth taking away is something that has the capability to charge at 2A will charge the same battery faster than something capped at .5 or even 1A etc.
You can buy another if you need it from guess where? your iPod or iPhone or USB port do not put out 10 watts, only the iPad charger does.
If my Irish Wolfhound doesn't like you neither will I.
2012 13" MBA, 2011 11" MBA, 2010 15" MBP, 2 iPad3s, 1 iPad Mini, iPhone 4S and iPhone 5. A bunch of iPods and an Apple TV.
The Apple charger puts out 1 amp ... at 10 volts that would be 10 watts.
Or if limited to 5 volts it would take 2 amps to equal 10 watts. Standard USB chargers won't charge your battery.
Actually,,,,,,,Originally Posted by madhatter61
1. Both USB and the iPad charger put out /charge at 5 "volts". (+ or - a small percentage)
2. The iPad charger puts out/can charge at 2.0 "amps". (2.1 to be exact)
3. Depending on the USB source, IE: your PC, car adapter, other plug-in style adapters etc, it can put out/charge "up to" typically 1.0 "amp" max.
4. Thus, both charge at 5 volts yet the iPad charger can charge at 10 watts and the other between 2.5 and 5.0 watts. (volts x amps = watts)
5. BOTH will charge the iPad.... Yet if only charging at 2.5 watts it will take significantly longer. Especially if the iPad is being used while charging. Basically the difference between a quick charge and a trickle charge. Never the less, both will charge unless the amps/watts provided during the charge are exceeded by the demand from the iPad battery etc.
Last edited by KJSmitty; 04-01-2011 at 12:05 AM.
I am using the PC007 iPad Adapter by Energizer to charge my iPad when using a computer USB port.
When possible, I always use the outlet adapter that came with the iPad. That adapter is just a neat accessory to have but not a necessity