To answer the op more literally yes there is software that can monitor the power consumption of a computer.
Measure power consumption pc.
Tips for reducing your electronics energy bill.
How to measure power draw with meters.
How to see a process s power usage details.
First open the task manager by right clicking your taskbar and selecting task manager or by pressing ctrl shift esc.
Available from amazon home depot hardware stores and other retailers for around 20 40 this power meter will let you take an accurate measurement of your pc s power consumption.
One of the easiest ways to measure the overall power consumption of your pc build is to invest in an external power meter.
Outervision power supply calculator is the most accurate pc power consumption calculator available and is trusted by computer enthusiasts pc hardware and power supply manufacturers across the globe.
All you need to do is plug the device into a wall outlet then plug your pc s power cable into the plug built into the power meter.
It s a must tool for estimating the power consumption of a modern desktop pc.
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Are you building a modern gaming pc low power htpc media server or maybe you need to figure out power requirements for a rack in a data center.
Microsoft s free joulemeter utility gives you a rough estimate of a windows system s power consumption.
After the device pulls some power for a while push some buttons to have the monitor auto calculate how many kwh will be used in a day week month or year providing an instant estimate.
By james norris 06 september 2015.
Calculate your pc s energy use.
But as you ve probably gathered from the other replies the extent of which can be measured may be limited by hardware software or requ.
Using these power meters couldn t be simpler.
If you don t see the full task manager pane click more details at the bottom.
It can be used to select a proper power supply unit for your system.