Ever wonder how much electricity is your laptop or computer consuming? Joulemeter by Microsoft is a freeware that estimate the power consumption of your computer. It tracks computer resources, such as CPU utilization and screen brightness, and estimates power usage.
As shown in the screenshot below, it is advisable to run Joulemeter for a number of days based on an average estimated consumption of kWh will be shown, multiply the kWh with your local electricity rates and the number of hours used per day, this will probably give you a rough idea of the energy consumed.
Learn a power model for your machine to get more accurate power data. For laptops, when the battery is at least 75% charged, disconnect the power cord. For desktops, connect a WattsUp meter (see instructions at the project webpage). Then, go to the Windows Start button, find the Joulemeter folder in your programs, expand it, and start Joulemeter Calibration.
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