when i want to charge my ipad with my computer it does not work but it can charge with the normal wall plug.
There is not enough power from the computer’s USB socket. The power can vary a great deal with cheaper computers (ignoring such things is how they keep the price down) but should be more reliable with a more expensive model. If you have the latter it may be worth having it checked by a computer repair store to verify that it is working correctly.
I don’t have an ipad but my phone’s charger puts out 5.1 volts. A standard USB port produces 5.0 volts and a limited amount of current.
Actually, the difficulty isn’t with the iPad, but with the USB port: It’s not supplying enough juice. 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. That’s a definite bummer, as it means you can’t use, say, your laptop to recharge your iPad on the road. In fact, Apple recommends finding an AC outlet and using the bundled 10-watt power adapter. That said, lower-powered USB ports will recharge an iPad–just very, very slowly.
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