How does a CPU idle (or run below 100%)?

Question

I first learned about how computers work in terms of a primitive single stored program machine.

Now I\'m learning about multitasking operating systems, scheduling, c

Answer 1

Just go to task manager, performance tab, and watch the cpu usage while you're doing absolutely nothing on your computer. it never stops fluctuating. Having an operating system like windows running, the cpu is going to ALWAYS be functioning, it never completely shuts down.

Having your monitor display an image requires your cpu to process a function allowing it to display anything. etc.

Everything runs through the CPU, just like your brain, it controls everything. nothing would function without it.