You are presented with the question "some light bulbs convert electricity into light and the amount of what?" and the following answer choices: 
- energy in a substance
 - hydrogen and oxygen
 - It decreases
 - matter vibrating
 - Inches or fractions of inches.
 - reducing acid rain
 - harmful substances
 - Males and females

Now knowing that some light bulbs convert electricity into light and heat energy and heat energy is the amount of energy in a substance, choose the best answer.


 

 energy in a substance        