Connect the Voltmeter: Simply connect the USB voltmeter to the USB port you want to test. The device will display the voltage, current, and power output of the port.

To determine the power, current, and voltage of a USB socket, Windows on-board tools, freeware, and test sticks from $10 can be used.

Instead of dealing with complicated hardwiring or draining your car's battery, you can simply plug your dashcam into the USB port and let it do its thing.

While all the USB ports in your car may look the same, that doesn't mean all work the same. It's possible that the USB port you're using to charge your phone is only capable of transferring data.

A car's USB ports can often charge plenty of accessories beyond phones, though you'll need USB-C to support power-hungry laptops and handhelds. You should always run CarPlay or Android Auto off ...

I have a USB port on my laptop that just seems "not right".My webcam doesn't work right when plugged into it, and I swear my USB drive seems less responsive when I use that port.Maybe it's just in ...