Is the black wire the positive wire?

Answer:
Conventionally, the black wire is used for negative voltages.

In an automotive car and certain other places like hooking up a car stereo then it would be the negative.

The electrical appliances in the house.The black wire would be the hot wire and the white wire would be the negative wire.
First answer by Apepper. Last edit by Tim9m. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 2 [recommend question].