There's a lot of odd messages and some odd answers here too lol.
Although this is an old question, the answer is as relevant today as it was back then so here goes.....
Tablets come in all sorts of charging variations, they vary in the type of connection used, and the voltage they take. The actual socket to charge may be mini-USB, micro-USB, or a standard socket/pin type. The easiest to break are the socket/pin types. No matter what make of tablet those pins are rubbish - too small to be strong, and they are expected to be knocked all over the place while the tablets in use and charging. The USB types tend to be stronger, but again the micro-USB (as used on most mobile phones) as are again not very strong.
If your tablet charges off a socket/pin type, it can be 5volt up to 12volt to charge it, and if its charged using either of the USB types then it's a 5volt charge. But that's not connected with the initial question, so . . .
Some tablets (if you're very very lucky) will have both a socket/pin and a USB charging port - you'l only know this by testing it. Plug in a USB cable (most mobile chargers will do for this purpose - but they will charge v e r y slowly lol), and if it charges up then that's ok :-) If it doesn't then you most likely need to fit a new socket/pin inside it :-( Some tablets (its rare though) like the Acer Arconia A500, have the socket on a wire so it's really easy to solder in a new one :-)
Every design of tablet has its own way of being held together unfortunately, so it's not possible to explain each and every model, but it's worth mentioning that a well known video site has videos of most specific tablets, and also keep in mind to be very very carefull on taking them apart as the screens (both the touch panel and the actual digital display) are very very fragile and can crack with very little effort :-(
A simple way to test if your socket is broken is to turn off the tablet, and take a tiny stic (toothpicks are ideal for this) and VERY gently see if you can move the charging socket - this applies to both socket/pin or USB types. If it wobbles about, it's probably broken inside.