Fact 1: Atoaster converts electrical energy into heat energy for toasting.

Fact 2: Early in human history, energy was first used by people for heating, lighting, and cooking.

Given the two facts above, answer the question "Toasters convert what into an energy that can also light and cook?" with the following options: 
- hydrogen and oxygen
 - solar energy
 - deoxyribonucleic acid
 - electrical energy
 - objects that have mass
 - chemical messengers
 - water energy
 - wind energy


 

    electrical energy     