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.
For a two-wire system with a negative ground, the positive wire is red, and the negative wire is white. For a two-wire system with a positive ground, the positive wire is white, and the negative wire is black. Lastly, there are three-wire systems that feature a center tap wire, which is colored white. The positive wire for these systems is red, and the negative wire is black. Learn more about Electrical.