It makes a huge difference. It actually costed me a job working on televisions. I went to radar school, where electrons flow from power to ground, and televisions work by electrons flowing from ground to power. The circuitry is completely backwards, and different electronic schools teach the different types of cicuitry. Radars can not function this way because they actually have to send out the electrons in order for them to be reflected back into the dish. In a television it doesn't really matter as much. A TV will have hot grounds so that it can feed electrons to power, but a radar does not have any hot grounds. So I did not know about them, and it was hard trying to work out the circuitry in reverse. I would have to start from ground to figure the electron flow because all the ciruitry is completely backwards. This is because I came from the negative universe where electrons are negative and flow from power to ground. All of the cicuitry from each "universe" is completely backwards from the other.