Energy Resources: Hydroelectric power Quiz

Fill in the gaps, then press 'Check'. Clues cost you marks. This quiz has a word list:
   dam      electricity      expensive      flood      flowing      fuel      generator      gravitational      Hoover      hydroelectric      lake      pollution      renewable   
Hydroelectric power means using water. Nowadays this turns a turbine which runs a to make electricity. This can be done with a water wheel and a fast-flowing stream, but a modern power station has a huge which creates a deep , which stores lots of potential energy in the water so it flows fast through the turbines.

The dam on the Colorada river in the USA provides for the city of Las Vegas.

Hydroelectric power is , needs no and produces no . However, the dams are to build and you need to a large area to create the lake, with environmental consequences.