power models

Power models are mathematical representations that estimate energy consumption based on hardware resource usage. In the context of Windows and Microsoft technologies, power models are used by tools like Joulemeter, a Microsoft Research project that measures the energy usage of virtual machines, servers, desktops, laptops, and individual software programs. Joulemeter works by monitoring hardware resources such as CPU, disk, memory, and screen usage, then converting that data into power estimates using automatically learned realistic power models. This approach allows for accurate energy profiling without external hardware, making it useful for optimizing power efficiency in enterprise IT environments and data centers.