Question detail
Why is no real energy transfer perfectly efficient?
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. Energy is always created and destroyed.
- B. Some energy is always dissipated as waste.
- C. Energy can only be transferred in one direction.
- D. All energy inputs are converted to useful work.
Answer
Some energy is always dissipated as waste.
Explanation
The correct option is "Some energy is always dissipated as waste.". Some energy is always dissipated as waste. is right because it directly matches Efficiency: (HT only) Describe ways to increase the efficiency of an intended energy transfer.. 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
Misunderstanding Efficiency Improvements
Students often think that increasing the input energy will always increase the efficiency of a system.
Emphasize that efficiency is about maximizing useful energy output relative to total energy input, and that reducing wasted energy is key to improving efficiency.
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