Fact 1: Agenerator converts kinetic energy into electrical energy.

Fact 2: Water behind a dam has potential energy that can be converted to kinetic energy.

Given the two facts above, answer the question "a generator is used to turn water behind a what  into electrical energy" with the following options: 
- dam
 - H20
 - hot
 - sewer
 - pond
 - gutter
 - wind
 - Heat


 

 dam        