1. Go to Control Panel
  2. Then click on View By: Small Icons to see Power Options
3. Next click on Power Options and then Change Plan Settings
4. Click on Change advanced power settings

5. This should open a window with various advanced settings, scroll down and find Processor power management under which you can set the Maximum processor state which is the CPU usage.

In the screenshot we have throttled the maximum CPU usage to only 25%. In order to track the CPU usage you can download https://www.alcpu.com/CoreTemp/. With CoreTemp you can enable logging which will log CPU temperature and usage every 10 seconds by default. The logs are saved in the same directory as the .exe file which by default is at C:\Program Files\Core Temp.

Hope that this has helped you with managing your CPU usage and temperature!