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.
In residential wiring, convention is that the black wire is hot and the white wire is neutral. This means that, if the circuit is wired correctly - and there is no fault in the circuit - the white wire should not have any potential difference (voltage) relative to ground.