chemical energy to light energy electrical energy to heat energy heat energy to chemical energy light energy to electrical energy
I gave my students this multiple choice question: What energy change takes place when a piece of bread is toasted in a toaster?

Only one answer is correct among these 4 choices:
- chemical energy to light energy
- electrical energy to heat energy
- heat energy to chemical energy
- light energy to electrical energy

Could you tell me which one is correct?

electrical energy to heat energy