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

Fact 2: Electricity flows when a battery is connected to an object like a watch, toy, or flashlight.

Given the two facts above, answer the question "What do flashlights require to produce light?" with the following options: 
- sunlight
 - energy
 - a light source
 - batteries
 - circuits
 - energy usage
 - heat energy
 - power


 

    batteries     