You are presented with the question "Devices require  to function" and the following answer choices: 
- A kernel
 - hydration
 - an electron lens
 - hydrogen and oxygen
 - heating liquids
 - a hydraulic system
 - kinetic energy
 - Something to move

Now knowing that electric devices require electrical energy to function and electricity is a kinetic energy, choose the best answer.


 

       kinetic energy  