Does hydroelectricity create electricity only?
Yes hydroelectricty refers to electricity genrated by water somehow. Waterwheels are good examples of these generators. There are SOME other things generated such as heat through the actual act of generating hydro electricity but that is assumed in every real world situation bound by the laws of physics.
Hydroelectricity is using the charges in water to create electricity, commonly exhibited through water falls. Reply # 2. answer by rbbt - Hydroelectricity is the use of running/moving water to power generators that in turn create electricity. (Electricity created through the use of hydro - ie. water)