Hello, From what I have learned, when someone refers to negative power, they are refering to a point in a circuit that has lower voltage compared to another area that has more voltage. For example, one test point in a circuit is 8 V while another test point is 4 V. That 4 V point in the circuit is -4 V in comparison to the 8 V point. I know there are transistors that work off of negative power (PNP) and positive power (NPN). NPN transistors work by positive power applied to the base lead while PNP transistors work by negative power applied to the base lead. This is what I don't get, if PNP transistors want negative power, then why don't you just use a NPN transistor and provide very little current to the base lead.... wouldn't that be the same thing? Also please provide an thorough explanation to my question, I really want to understand this. Thanks you very much.