In every way, the 2012 French Open women's singles final appeared to be a mismatch. Maria Sharapova, the winner of multiple grand slams, towered over Sara Errani, who was in her first grand slam final, in both size and stage presence. As the two 25-year-olds met at the net for their pre-match photographs, Errani barely cleared Sharapovaâs shoulder.
The term common is applied to the conductor that is used in any configuration of the circuit. It is easy to confuse common with the neutral wire, and in many cases this is true. A ceiling fan often has separate black and blue wires for the fan and light with the white wire, or neutral, being common to both.
The black wire is used for power in all circuits. The black wire is not the common wire, and it is never used as a ground or neutral wire. It should always be considered hot or live and is the power feed to an electrical outlet. It is also often used as a switch leg, which is the connection from the switch to the electrical load. Learn more about Electrical.