Question detail
Which of the following statements about power is true?
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. Power is the same as energy
- B. Power is the rate at which work is done
- C. Power can only be measured in watts
- D. Power is independent of time
Answer
Power is the rate at which work is done
Explanation
The correct option is "Power is the rate at which work is done". Power is the rate at which work is done 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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