Thanks again, Kappy for your quick response. I know it's not much of a techy question, but it concerned me when I felt the plug. It sounds like it's normal, but will probably not leave home while Pad is charging just to be on the safe side (probably not a good idea to leave home anyways).
Back to playing w/iPad.
Yes, it gets warm.
The quickest way (and really the only way) to charge your iPad is with the included 10W USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter (5W). When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge very slowly (but iPad indicates not charging). Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.
Apple recommends that once a month you let the iPad fully discharge & then recharge to 100%.
How to Calibrate Your Mac, iPhone, or iPad Battery
At this link http://www.tomshardware.com/reviews/galaxy-tab-android-tablet,3014-11.html , tests show that the iPad 2 battery (25 watt-hours) will charge to 90% in 3 hours 1 minute. It will charge to 100% in 4 hours 2 minutes. The new iPad has a larger capacity battery (42 watt-hours), so using the 10W charger will obviously take longer. If you are using your iPad while charging, it will take even longer. It's best to turn your new iPad OFF and charge over night. Also look at The iPad's charging challenge explained http://www.macworld.com/article/1150356/ipadcharging.html
Also, if you have a 3rd generation iPad, look at
Apple: iPad Battery Nothing to Get Charged Up About
Apple Explains New iPad's Continued Charging Beyond 100% Battery Level
New iPad Takes Much Longer to Charge Than iPad 2
Apple Batteries - iPad http://www.apple.com/batteries/ipad.html
Extend iPad Battery Life (Look at pjl123 comment)
New iPad Slow to Recharge, Barely Charges During Use
Tips About Charging for New iPad 3
Prolong battery lifespan for iPad / iPad 2 / iPad 3: charging tips
iPhone, iPod, Using the iPad Charger
Install and use Battery Doctor HD
In rare instances when using the Camera Connection Kit, you may notice that iPad does not charge after using the Camera Connection Kit. Disconnecting and reconnecting the iPad from the charger will resolve this issue.
I think so to. All the IPad chargers run warm. I believe the IPad 3 is about 8,400Mah?
Which is just based on watt hours divided by voltage=Amp Hours.
Plus I believe it's called Peukarts law?? The higher the load being drawn from a rechargable battery is, that inversely affects that batteries actual total stored capacity. Most capacity national approved testing procedures are done at 25
degrees Celsius, and the load attached to the fully charged battery whatever it's voltage, has to be at 1/20th
of filled capacity per hour. So the rating systems are heavily slanted to the manufacturers advantage. (Nothing new there)
1/20th of capacity I believe is whatever power drain level it will take to empty the battery that is hooked up to the load in 20 hours. So power drawn is no more then 5% of capacity per hour. If you increase the load level to 1/10 of capacity per hour, that will shorten the total capacity number or power storage of that battery.
At 1/5C or a load level that is 20% of batteries claimed capacity, it's real world capacity numbers drop off by 20-25% I believe. So a battery rated at 10,000 Mah that was tested at a drain level of 5% per hour or 1/2 amp hour per hour, or 2.5 watts at 5 volts per hour or a measly 500 Mah per hour, which is in compliance with the National Testimg Standard, at a 1/5 load level, the power it takes to drain the battery in 5 hours, in this case 10 watts at five volts per hour, if that was the Standard used, would have to be rated at 7500-8000 Mah. Or about 7.5-8 AH down from 10 AH.
I do know from memory if you take a 10,000 Mah 5 volt battery, which is 10 amp hours at 5 volts, or 50 watt hours, and apply a 1/2C per hour load level, which would be half total capacity of the battery, just the higher power drain itself, lets say that would be 5AH or 25 watt hours per hour, instead of two hours before the battery is drained out, it goes completely dead in just one hour. So at .5C per hour, which in this ex would be 5,000Mah or 25 watt hours per hour, that would use up and be the whole stored power the battery could deliver. A 50% power load reduces a batteries stored power Potential by 50%. It's rated capacity would be 5,000 Ah or 25 watt- hours instead of the "standardized" rating of 50 watt-hours.
This is, I am starting to believe, possibly why everyone is reporting shorter real world running times attainable compared to Apples published specifications that you can find on its own website listed under IPad 3 watt-hours usage of 42 watt hours as Tom reported.
I figure the engineers had to ignore this principle and were possibly asked to undersize the battery for weight and appearance and aesthetics involved. And am guessing they were well aware of Peukarts Law, which I hope I am remembering correctly! The IPad 3 has a much faster load drain then the IPad 2 so instead of the 42 watt hour capacity they gave it, they probably needed at least 52 watt hours or about 10AH instead of their stated 8.4AH.