Fact 1: Adoorbell converts electrical energy into sound.

Fact 2: Electricity is a kinetic energy.

Given the two facts above, answer the question "A doorbell converts _ into sound" with the following options: 
- a hydraulic system
 - rays or beams
 - deoxyribonucleic acid
 - kinetic energy
 - encoded information
 - sensory neurons
 - circulatory systems
 - Loud noises


 

    kinetic energy     