Fact 1: Aflashlight requires a source of electricity to produce light.

Fact 2: Electricity is usually provided by batteries or AC current.

Given the two facts above, answer the question "What can a flashlight use to produce light?" with the following options: 
- energy usage
 - calcite
 - prism
 - batteries
 - gold
 - energy
 - heat energy
 - thoughts


 

    batteries     