Fact 1: When electricity flows to a light bulb , the light bulb will turn on.

Fact 2: Electricity is electrons in motion.

Given the two facts above, answer the question "what flows to a light bulb to turn it on?" with the following options: 
- heat energy
 - protons
 - Solar energy
 - neutrons
 - direct energy
 - energy
 - electrons
 - light switch


 

       electrons  