Fact 1: Awindmill converts wind energy into electricity primarily by using mechanical energy.

Fact 2: Today, new kinds of windmills, called wind turbines, generate electricity.

Given the two facts above, answer the question "What type of energy does a wind turbine use to convert wind energy?" with the following options: 
- energy
 - unidirectional
 - mechanical
 - thrust
 - waves
 - rays or beams
 - direct energy
 - adding heat


 

   mechanical      