Keep in mind that any voltage, by definition, is a difference in electric potential energy between two points. So while we may say that a voltage source has a voltage of 1.5V, we are actually saying that the voltage between the negative and positive polarities of the voltage source is 1.5V.
Jacksonville, Texas. As of the census[1] of 2000, there were 13,868 people, 4,882 households, and 3,358 families residing in the city. The population density was 981.0 people per square mile (378.7/km2). There were 5,397 housing units at an average density of 381.8 per square mile (147.4/km2).
In the city the population was spread out with 24.3% under the age of 18, 36.3% from 18 to 24, 25.9% from 25 to 44, 8.8% from 45 to 64, and 4.8% who were 65 years of age or older. The median age was 22 years. Jacksonville has been named the youngest city in the nation (lowest median age) on various lists.