Fact 1: An electric stove transforms electrical energy to heat energy.

Fact 2: Heat is also produced by friction, or mechanical energy, chemical energy, and electrical energy.

Given the two facts above, answer the question "An electric stove transforms electrical energy into what?" with the following options: 
- friction
 - warmth
 - boiling
 - waves
 - photons
 - engines
 - Light
 - food


 

 friction        