You can charge the iPad by either plugging it into your computer, or using the iPad 10W USB Power Adapter. You can also charge it while it is docked. If you have a plug nearby, use the 10W power adapter to get a faster charge most of the time. Note that many USB ports cannot deliver the current required to charge the iPads battery. This is why you will Not Charging on the display when you connect it to some computers.
It can charge on both. To charge on the wall you need to use the USB power adapter that comes bundled with the iPad
You need the original adapter that came with your iPad. Connecting a USB cable to a PC or using an iPhone or iPod charger won't work since it doesn't have enough power to charge the iPad's huge battery.
try getting a new charger
Email it to the iPad's email account, import it using a Camera adapter and USB cable or SD card, or bring it into iTunes or iPhoto (Mac) and sync the iPad.
Unless you have a recent Mac, the USB port does not have enough current to change the huge iPad battery. You must use the AC adapter that came with the iPad, or other compatible power supplies.
The iPad AC adapter can be used to charge just about any device that uses a USB cable for charging. The high-capacity power supply means that it will handle just about any mobile device.
One way you can do this is you can email them to yourself. Also you can buy an adapter that you can hook your camera up to. When you buy this it comes with another adapter that you can insert a SD card into. This adapter set only costs around $30 in the USA.
No, The port on an ipad is a device port, not a host port. You would have to get a USB on the go adapter for iPad to connect external devices.
Internet Protocol Adapter
Internet Protocol Adapter
You can charge your iPad either way - it doesn't need to be on or off. However, the most effective way is to charge your iPad when it's off. It will charge much faster.