You are presented with the question "what are on when there is flow of current in an electrical circuit" and the following answer choices: 
- energy
 - lights
 - engine
 - cycles
 - brakes
 - waves
 - water
 - Vibrates

Now knowing that aswitch is used to start the flow of current in an electrical circuit and electrical power including lights etc can then be switched on, choose the best answer.


 

  lights       