What does an idle CPU do?

In the last post I said the fundamental axiom of OS behavior is that at any given time, exactly one and only one task is active on a CPU. But if there’s absolutely nothing to do, then what? It turns

Idle CPU usage of k3s is high and continuously increases over time

Solved Recall that the percentage of CPU idle time is given

Building a low power PC on Skylake – 10 watts idle

What does an idle CPU do?

What is the System Idle Process and Why Is It Using Most of the CPU?

Windows 10 Help Forums

High CPU use at idle - Rhino for Windows - McNeel Forum

System Idle Process - Tech-FAQ

PS99 idle CPU and GPU test because yes

What Are Good Idle CPU Temps?

Windows 10 Help Forums

Understanding CPU Utilization in Linux: Site24x7

Solved: What is the normal idle temperature for my laptop? - HP Support Community - 6118251

What is the “System Idle Process”, and why does it sometimes consume a lot of CPU? - Quora