Question detail
If two devices transfer the same amount of energy but one does it in half the time, what can be said about their power ratings?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Energy changes in a system, and the ways energy is stored before and after such changes
Question
- A. They have the same power rating
- B. The faster device has a higher power rating
- C. The slower device has a higher power rating
- D. Power cannot be compared without knowing the energy
Answer
The faster device has a higher power rating
Explanation
The correct option is "The faster device has a higher power rating". The faster device has a higher power rating is right because it directly matches Power: Define power as the rate at which energy is transferred.. 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 Power Definition
Students often confuse power with energy, thinking it refers to the total energy transferred rather than the rate of transfer.
Emphasize that power is defined as the rate at which energy is transferred, measured in watts (joules per second).
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