1) Assignment on hydroelectric power.
2) Like wind, moving water has been anenergy sourcefor centuries. Today, the powerthat falling water generates, known as hydroelectric power drives turbines that produce electricity.
3) The water held in a reservoir behind a dam is a form of stored energy that can be released through the dam to produce electric power.
4) In the United States, hydroelectric power plants produce about 5 percent of the country's electricity.
5) Although water power is a renewable resorce, hydroelectric dams have finite lifetimes. Eventually, the sediment fills the reservoir, the dam can no longer produce power.
6) There are hydroelectric dams in many parts of the United States, with the greatest concentration in the Southeast and the Pacific Northwest.
This limits future expansion of hydroelectric power.
