Acoustical -> Mechanical -> Electrical Mechanical -> Acoustical -> Chemical Chemical -> Electrical -> Acoustical Electrical -> Acoustical -> Chemical
I gave my students this multiple choice question: Which of the following best shows the basic three-step energy transformation for a battery-operated radio?

Only one answer is correct among these 4 choices:
- Acoustical -> Mechanical -> Electrical
- Mechanical -> Acoustical -> Chemical
- Chemical -> Electrical -> Acoustical
- Electrical -> Acoustical -> Chemical

Could you tell me which one is correct?

Chemical -> Electrical -> Acoustical