Question detail
If two devices transfer the same amount of energy but one does it in half the time of the other, how do their power ratings compare?
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. The device that transfers energy faster has a higher power rating
- B. Both devices have the same power rating
- C. The device that transfers energy slower has a higher power rating
- D. Power ratings cannot be compared without additional information
Answer
The device that transfers energy faster has a higher power rating
Explanation
Power is determined by the rate of energy transfer; therefore, the device that transfers energy in less time will have a higher power rating.
Common mistake
Misunderstanding Power Definition
Students often confuse power with energy, thinking it is the total energy transferred rather than the rate at which work is done.
Emphasize that power is defined as the rate at which work is done, and it is measured in watts (W), which is equivalent to joules per second.
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