yes, there is some automated programs, and servers can self save and delete old file that they don't need and the technology is improving all the time so soon there will be computers that can even turn itself on and control itself.
can a computer function/work without ac current
Not without surgical intervention while you're still in the womb.
To power your computer without a battery
Unlikely without extraordinary medical intervention, but remotely possible.
The hard drive
Computer aided, means that solution are found using a compter and then analysed and used by human intervention. Compter integrated, means that the solutions are applied directly to the machines in the manufacturing process, without human intervention.
You cannot get free Gems on Clash of Clans without a computer.
There are no disadvantages of computer hardware, because without it, the computer would not be able to function, or even exist for that matter!
Yes, it is. Because it is outside the computer, is a secondary device because your computer can function without it.
Yes, this is an internal function of the computer. You need a writable cd and the file on your computer.
No, but it won't function without one.
Storage devices are the core function and fundamentals of computers. The purpose of the storage device is to store information. If storage devices are removed from the computer, storing the information retrievals wouldn't be possible.