An incandescent light bulb converts electricity into light by sending electricity through a filament, and an incandescent material is so hot that it glows, producing light. Given these facts, what happens when incandescent bulbs get hot among the following options:
- energy
 - They burn out
 - sunlight
 - They glow
 - heat energy
 - They explode
 - uncontrolled
 - They turn off


 

    They glow     