Question

The light bulb transfers electrical energy into light. What is one type of energy that is also generated that is NOT a desired effect? A) chemical B) heat C) mechanical D) sound

Answer 1

i think it is heat because the lightbulb gets super hot when its turned on

Answer 2

The old style (incandescent) light bulb converts more energy
into heat than it does into light.  If you're using it mainly as a
source of light, then it's a bummer, and its efficiency is very low. 
BUT ... if you're using an incandescent light bulb as a heater, then
its efficiency is much better.  It all depends on your point of view.