Fact 1: Alight bulb converts electrical energy into light energy when it is turned on.

Fact 2: Most of the energy a light bulb uses turns into heat.

Given the two facts above, answer the question "A light bulb uses what when it converts electrical energy?" with the following options: 
- SO2
 - O3
 - copper
 - nektar
 - heat
 - waves
 - tube
 - fibers


 

     heat    