It is used up by the light in the refrigerator. It is released to the surroundings as heat. It is converted into mechanical energy. It stored as a form of potential energy.
Robert is thinking about buying a new refrigerator. His old refrigerator runs at about 43% efficiency. Which most likely accounts for the remaining 57% of the energy?

Options:
- It is used up by the light in the refrigerator.
- It is released to the surroundings as heat.
- It is converted into mechanical energy.
- It stored as a form of potential energy.

It is released to the surroundings as heat.