In this video, https://www.youtube.com/watch?v=ks_VShSgPns, a 220 ohm resistor is connected across a 5V DC source (the source happens to be oscillating between 0V and 5V but that's besides the point).
I would think that, by ohm's law, the current through the resistor is I = V/R = 5/220 = 22.7mA, and I'm sure this would indeed be the case with an ideal voltage source (I think he demonstrates it at some point in the video).
However the point in this video is to illustrate that the voltage provided across the black and yellow wires cannot push enough current and is a "bad source", and so when measuring the actual current at 0:58 in the video, the reading is only 0.29mA.
This reading clearly does not obey ohms law, as the resistor would technically have a value of around 17k ohms in this case.
My question is, what is exactly happening here? Is the resistor simply not being "put to test" because the source cannot push current in the first place? Or why is ohm's law not being obeyed?