A phone charges just fine when plugged into a computer's/Laptop’s
USB port. The same goes for an iPod, a pocket camcorder, and any of countless
other devices. But there is a problem with iPad !!
Actually, the difficulty isn't with the iPad, but with the
USB port: It's not supplying enough power. The ports built into most desktops,
laptops, and even powered USB hubs don't generate the 10 watts necessary to
charge an iPad's battery, which is why the ‘Not Charging' message appears over
the battery indicator. This means you can't use, say, your laptop to recharge
your iPad on the road.
That said, lower-powered USB ports will recharge an
iPad--just very, very slowly. When the tablet's screen is off, the battery does
indeed draw a trickle of power. Turn the iPad back on, however, and you'll see
‘Not Charging' again.
You should be aware that many PCs pump varying wattages
through different USB ports. Frequently the USB ports at the front of the PC
are of lower power than the ones in the back. Before giving up, try moving to
another port.
There is another option there are different AC USB chargers that
are available at Apple stores, that one can buy in order to charge the ipad.
Now I got my answer why my iPad doesn't charge
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