Hi, please could someone help me with NPN transistors. I found this veritasium video on YouTube () and do not think it is correct. He shows a diagram towards the end of the video with a source and drain which I looked up and source is collector and drain is emitter. He clearly shows electrons flowing from source to drain (collector to emitter) but I don't think that's right. In a conventional circuit current does indeed flow from collector to emitter for an NPN transistor but this assumes conventional current flow (i.e. positive charges flowing). Therefore, surely you must state that holes flow from source to drain to be correct here? If your talking about electrons I would have thought you would have to talk about non-conventional current flow i.e. electrons go from negative terminal across the transistor from emitter to collector to the positive terminal? Or to put in better words - electrons move from emitter to collector or holes move from collector to emitter. Or have I got it all wrong?