The black wire is the “hot” wire, which carries the electricity from the breaker panel into the switch or light source. The white wire is the “neutral” wire, which takes any unused electricity and current and sends them back to the breaker panel.Click to see full answer. Then, what happens if you connect white wire to black wire?Inside an outlet’s electrical box, the black (hot) wire should be connected to the brass-colored terminal on the outlet. The white (neutral) wire should be connected to the silver-colored terminal. If these connections are backward, the polarity is wrong.One may also ask, what do black and white wires mean? A black wire is generally considered to be a hot wire which is to say it carries current. The white wire is generally considered to be what it’s called a neutral wire which in other terms would be considered to be a ground but not an earth ground. If you add a bare wire or green wire that one is an earth ground. Hereof, can I connect white wire to black? Re: White and black wire crossed A single black and white connected together is normal. It is part of a switch loop. A black connected to a group of whites is not normal and probably should be connected to the other blacks. It is normal to have a white connected to a group of blacks if a switch loop is used.What if both electrical wires are black?Black means hot, white signifies neutral, and green indicates ground. However, if you need to rewire a light switch or a plug socket, you may occasionally come across two black wires. It’s essential that you determine which black wire is hot before proceeding.