Hi Mi Fans,
Given so many devices now power themselves using a USB connection, it's important to know how much power the USB port on your laptop can supply. If a device tries to draw more power than the port can supply, you risk killing the port---or even starting an electrical fire.
Not all USB ports are created equal. Your machine might have a mix of USB 2.0 and USB 3.0 connections, each of which might have different outputs. Knowing a USB plug's power output also helps to determine if there are any problems with your ports. For example, if a port is not charging gadgets as quickly as normal, you might discover its power supply is not as high as it should be.
How To Check The Power Output Of A USB Port
To check a laptop's USB port voltage on Windows, download the free USBDeview. It's a portable app, so no installation necessary.
Once you fire up the app for the first time, you will see a complete list of all the USB devices that you have ever used, as well as a list of your USB ports. The ports which are currently active on your machine are highlighted using a green checkbox. To see the details of a USB port, double-click on its name. You will see all the information about the port, including when it was last used, whether it is safe to unplug any currently-connected device, and a whole lot more. To check the power output, locate the Power field. It will show you how many milliamperes the port can supply.
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