They are connected in series positive (+) to negative (-) for greater voltage, or in parallel (+ to + and-to -) for greater current capacity. The individual cells inside a 9-volt battery. An everyday examples of a battery is the 9-volt transistor battery, which is six 1.5-volt cells in series.
Definition of Erie Canal. Definition: The Erie Canal was the nation's first Important transportation system connecting the Atlantic Ocean, via the Hudson River in Albany, eastern New York, with Lake Erie. The Erie Canal stretched for 363 miles providing the first waterway connecting the Great Lakes with the Atlantic Ocean.
Hence its importance. Points of the river between Vicksburg and Port Hudson were held as dependencies; but their fall was sure to follow the capture of the former place. Vicksburg was important to the enemy because it occupied the first high ground coming close to the river before Memphis. From there a railroad runs east, connecting with other roads leading to all points of the Southern States. A railroad also starts from the opposite side of the river, extending west as far as Shreveport, Louisiana.