dkl65:
Before, I tried to measure the current without anything in the circuit. Yeah, I know how to measure currents now, because I read a book, and looked at the instruction sheet of the multimeter. That was a few months before. The person in the video stated that the electrons go from the + to -; NOT TRUE! I know that it is a conventional way (due to past misunderstandings), but electrons move from - to +, because they are pulled from the ground (negative in DC) by the positive charge at the positive terminal.
Note even that. Potential may appear to "flow" but mostly we have free electrons being exchanged along a path. You can take any model you want and it can be reduce to quantum levels where models like "flow" make little sense.
Not really related to your problem, but the practical advice on how to properly measure current from a technician's (as opposed to a physicist's) POV is still germane.
The primary advice here is "don't short out your computer USB power connects." Which is still pretty good advice, right?