A computer can run without an operating system but each piece of software would have to be written to "talk" directly to the computer's hardware - displaying something on the screen, saving to discs etc. An operating system provides a standard layer that connects to the hardware so that applications can ask the OS to do something and not worry about the details.
If you apply power, yes. But it will be able to do considerably more with an OS.
The operating system (OS) supplies the user interface by which there is an interaction. No OS = expensive paperweight (can't use the hardware)
A computer can not operate without an os, different OS's have different UI,s
Your OS/Operating System handles all features on your computer. The OS deals with the computers tasks from running a program to the saving of files. You cannot have a working computer without an OS.
can a computer function/work without ac current
The program that enables a computer to function properly is called an operating system (OS). Examples of operating systems include Microsoft Windows, macOS, and Linux. The OS manages hardware resources, provides a user interface, and facilitates communication between software applications and the computer's hardware. Without an operating system, a computer would be unable to perform tasks effectively.
You cannot 'remove' the Mac OS. The computer will not function without it. Macintosh computers need, and can only function with, the Mac OS. What you can do, possibly, is revert to an earlier version of the OS, if you still the disks the computer came with, or you can possibly upgrade to newer OS than the one you are currently using. If you want to revert, then insert the installation disk and set it as the start-up disk and then follow the onscreen instructions. This will delete the existing OS and install the desired one. If you are upgrading, insert the installation disk and set it as the start-up disk. Then follow the instructions. This will upgrade the existing OS to the newer one.
To power your computer without a battery
If you have an image for you OS system partition you can recover it, if you have an advance OS you can refresh it without formatting like "win 8 or 10", you can do a system repair for your OS without affect or loose you files but not recommended, otherwise you have to make new operating system.
A computer running Mac OS will be an Apple Macintosh computer.
All are functions of the OS.
The hard drive