Additional Tips Using a Multimeter: If you have a multimeter, you can also use it to check the voltage of a USB port by connecting it to the external pins of the USB-A connector.

Testing relays and their circuits in vehicles doesn’t always require a trip to the bench. With a few simple tools and ...

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

He had purchased a fairly high-tech voltmeter, but there were so many settings and options he never figured out how to use it. So here’s a primer for any voltmeter. First, find the on/off switch.