Is the Big Prong Negative

Some three-prong plugs are also polarized, and when they are, the same rule applies: the larger prong connects to neutral. On a polarized, grounded cord, the smaller prong connects to hot and the semi-rounded pin underneath the two prongs connects to ground.

Is the wide plug positive or negative?

The wide prong on the plug links the threaded base of light bulbs to the neutral terminal (the wider slot) in the receptacle. The hot side of the outlet (the side that can deliver a shock) is wired to the threaded socket if the wires are reversed.

Which prong is positive on a wall plug?

The black wire is positive, the white wire negative, and the green wire ground. With speakers, you have a wire with a copper strand and a wire with a silver strand. The silver strand identifies the negative wire.