 Hello this is yet another video on this defective USB cable so in the first video I showed how this defective USB cable makes that devices that require power will not behave correctly because there is too much power loss in this cable. Second video I showed how to measure the resistance of USB cables using a USB meter and here we are going to use a multimeter digital multimeter to make the measurements to measure the resistance here in this cable. Now this is quite an old multimeter that I have think about 35 years old and if I short the probes you will see the resistance doesn't go exactly to 0 but still it is usable for the measurements if we deduct the 0.5 of the well the total resistance here. So I have my USB cable here with four wires in it and a shield four wires wire one and wire four for the power plus is wire one negative minus is wire four and then wires two and three are the data cables which we are not going to take into consideration here and then my breakout connectors have arrived I have two USB three to screw connectors here ten connectors because in USB C you have extra sorry USB three you have extra wires but here we are only going to use wires one and four and I've already put in some small wires to do the measurements so I connect my end here and then here this micro USB I don't have a micro USB breakout connector so I have an adapter here from micro USB to USB A of course all these connectors are also adding to the resistance that is being measured and but because this wire here has several ohms here we can neglect the resistance in these extra connectors so now if I measure for example the two end points of wire one I have about 3.1 ohms and if I measure the other wire wire four then about 2.6 and remember we have to deduct the value we have here 0.4 0.5 because this is an old meter and no longer properly calibrated for measuring resistance and and it also doesn't have a button to set the resistance to zero when measuring when there is a short so what I'm going to do now is here connect the two wires one and four together so that I can measure over both wires directly the resistance of both wires so I'm putting them in serial connection so in Siri not in parallel I'm short cutting here one and four and then on the other end here I can measure the total resistance of both wires and I'm going to use crocodile connectors of course we should also test these now 0.4 like this and we have about five ohms and if we deduct the zero point if we subtract 0.4 of the internal resistance here then we arrive at 4.6 which is quite comparable to the 4.7 we measured with USB meter if I'm not mistaken it was 4.7 and now just to compare here is a USB cable that is not the defective electrically it has a much lower resistance as you will can see so here the resistance is about 0.4 0.5 which is acceptable for powering devices this cable here it's resistance is way too high you you lose too much power over this cable so there is a voltage drop and then the devices no longer work properly