Fact 1: Adoorbell converts electrical energy into sound.

Fact 2: Hearing is the act of perceiving sound.

Given the two facts above, answer the question "What converts electrical energy into what we hear?" with the following options: 
- a doorbell
 - sensory neurons
 - a solar panel
 - a battery
 - Firecrackers
 - waves
 - a water pump
 - engines


 

 a doorbell        