Voltage and potential difference are the same thing. Nobody out of school uses the latter term. Voltage is the potential in an electrical circuit to cause the flow of current (ie, electrons). wikipedia: Voltage is commonly used as a short name for electrical potential difference.
Population of Jamaica 2014. As of 1 January 2015, the population of Jamaica was estimated to be 2 767 704 people. This is an increase of 0.73 % (20 112 people) compared to population of 2 747 592 the year before. In 2014 the natural increase was positive, as the number of births exceeded the number of deaths by 34 785. Due to external migration, the population declined by 14 672. The sex ratio of the total population was 0.969 (969 males per 1 000 females) which is lower than global sex ratio.
The island, 10,990 square kilometres (4,240 sq mi) in area, lies about 145 kilometres (90 mi) south of Cuba, and 191 kilometres (119 mi) west of Hispaniola, the island containing the nation-states of Haiti and the Dominican Republic. Jamaica is the fifth-largest island country in the Caribbean.ith 2.8 million people, Jamaica is the third most populous Anglophone country in the Americas, after the United States and Canada, and the fourth most populous country in the Caribbean. Kingston is the country's capital and largest city, with a population of 937,700.