You are presented with the question "Alerting devices inform a person when they convert electrical energy into what" and the following answer choices: 
- sound
 - batteries
 - air
 - heat
 - energy
 - action
 - photons
 - waves

Now knowing that adoorbell converts electrical energy into sound and alerting devices inform a person when the doorbell rings, alarm clock sounds, or telephone rings, choose the best answer.


 

 sound        