Fact 1: Some light bulbs convert electricity into light and heat energy.

Fact 2: Light Bulbs Incandescent bulbs are available at the front desks.

Given the two facts above, answer the question "Incandescents convert electricity into light and what" with the following options: 
- energy
 - house
 - renewable energy
 - home
 - heat energy
 - motion
 - kinetic energy
 - heating liquids


 

     heat energy    