Why is my tablet getting hot

The tablet is hot because computers get hot. The long and short of it is that whenever energy is used, such as electricity, some of that energy gets wasted as heat. Some computers are worse offenders than others, but devices like your cell phone don't get super hot because of the high-efficiency and low-power equipment that comes as an industry standard.

The RCA Voyager II has many hot-spots on the back of the tablet, such as the APU, the power regulator, etc. Even the charging cord can get hot sometimes. This is normal. The worst temperature it could be is like a slightly overused heat pack during winter. If it gets hot enough that it becomes hard to hold on to, then there may be a fault internally causing the device to heat up exceptionally quickly. Alternatively though, it is also likely that the device isn't as efficient or low-power as has been intended. Again, this isn't something to worry about - Manufacturers take these things into account.

Tablets and phones usually work by radiating the heat ambiently, which is what makes them so silent in opposition to even modern day computers. No whirr- from a fan, just the plastic - or aluminium if you're talking about Apple - enclosure to transmit the heat outwards.

Any computer will generate heat. Warm to the touch is usually completely harmless, and normal. However, if it almost burns - or somehow actually does - then it is a problem that needs to be examined. Soon. Otherwise there'd be a "Caution! Hot!" sticker somewhere on it.

Hope this helps!