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.
Why is the Panama Canal so Important? Until the Panama Canal was completed, a ship's captain who wanted to travel from New York to San Francisco had to go all the way around the continent of South America. Passing the southern tip was very dangerous because of its proximity to Antarctica and the South Pole.