An incandescent light bulb converts electricity into light by sending electricity through a filament, and additional electricity is stored in the battery. Given these facts, what can convert battery energy into light among the following options:
- incandescent light bulbs
 - motors
 - focusing a lens
 - an electron lens
 - generators
 - speakers
 - hydrogen and oxygen
 - Firecrackers


 

 incandescent light bulbs        