If you have a laptop that runs Windows 7,you can test how efficient it is by using the efficiency calculator.The calculator generates loads of useful information about power consumption and can give you an idea of how to boost your battery life and overall performance.To get to the efficiency calculator, you need to open a command prompt as administrator by typing ‘cmd’ (without the quotes) from the Start menu.
When the cmd icon appears, right-click it and choose ‘Run as administrator’. Now type in ‘powercfg -energy’ (without quotes)and hit Enter. Windows 7 will now scan your system looking for ways to improve power efficiency. It will then publish the results in an HTML file, usually in the System32 folder. Just follow the path it gives you to find your report
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