The "main brain" of a computer is usally known as the CPU or the Processor(s) but really if you think about it a brain can compute and store so really the "main brain" would be the CPU and a harddrive or other storage device
main processing device on a computer
The main circuit board of the computer is the motherboard.
A computer operator is someone who's main job is interaction with the computer. It can be someone who inputs data, or someone who is getting information from the computer.
Its Central Processing System (CPU)
What the main danger in downloading files to an office computer
the motherboard is the main motherboard. The only way you can have a main motherboard is if you have more than one in a computer witch are usually servers. 99.99999% of computer have one motherboard and that is the main object of a computer
Computer memory
Yes, they can.
The main circuit board of a computer is referred to as the motherboard.
No, a main computer is not necessary as the router can be plugged into a socket.
CPU - Central Processing Unit which performs logical calculations
Monitor, or your main display screen