AC is both postive and negative, thats why its called AC(alternating current) it switches from negative to postive once every second.

like weed4life said, the white is the neutral (grounded) and the black is the hot(ungrounded)
higher4hockey Reviewed by higher4hockey on . quick wiring question Hey whatsup, i am in the process of supplementing my grow with cfl's. I have bought the sockets, cords, plugs and bulbs. the problem is that the cords have no + or - markings.. Okay, there are 2 wires coming from the mogul socket, one is black, one is white, both have no markings. Also, the screws in the plug that im wiring it into are both silver so i was also wondering which prong is positive, the fat or skinny? Thanks. Rating: 5