Question detail
In a household refrigerator, which energy transfer is considered useful?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Conservation and dissipation of energy
Question
- A. Heat removed from the interior to the surrounding air
- B. Electrical energy used to run the compressor
- C. Heat generated by the compressor motor
- D. Heat lost through the walls of the fridge
Answer
Electrical energy used to run the compressor
Explanation
The correct option is "Electrical energy used to run the compressor". Electrical energy used to run the compressor is right because it directly matches Efficiency: Identify useful and wasted energy transfers in a device or process.. The other options are less suitable because they change the required Physics relationship, confuse the relevant energy store or use a distractor that does not answer the question.
Common mistake
Confusing useful and wasted energy
Students often label all energy moving through a device as useful, ignoring energy lost as heat or friction.
Explain that useful energy is that which performs the intended work (e.g., mechanical work, light, sound), while wasted energy is energy that leaves the system in less useful forms such as heat, sound, or vibration, and is not used for the device’s purpose.
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