Автор работы: Пользователь скрыл имя, 20 Апреля 2011 в 01:12, реферат
Hydropower is renewable energy source that is derived from the energy of moving water. Hydropower is not only used to create electricity but also for some other purposes such as irrigation. People have started using force of the moving water very early, mostly for irrigation purposes, and according to current data irrigation has been used in ancient Egypt and Mesopotamia since the 6th millennium BC.