Question detail

If two devices transfer the same amount of energy but one does it faster, what can be said about their power ratings?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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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

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: Compare devices with different power ratings using energy-transfer examples.. 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

Power Ratings Comparison

Students often confuse power ratings with energy transferred, thinking that a higher power rating means more energy is transferred overall, rather than in a given time.

Clarify that power is the rate of energy transfer; a device with a higher power rating transfers energy faster, not necessarily more energy overall.

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