Fact 1: An incandescent light bulb converts electricity into light by sending electricity through a filament.

Fact 2: Standard filaments are made of tungsten.

Given the two facts above, answer the question "What does an incandescent light bulb use to convert electricity into light " with the following options: 
- energy
 - light
 - heat energy
 - Tungsten
 - heat
 - Neon gas
 - Coal
 - Helium


 

    Tungsten     