Question detail
If a device transfers 100 joules of energy in 5 seconds, what is its power?
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. 20 Watts
- B. 25 Watts
- C. 50 Watts
- D. 100 Watts
Answer
20 Watts
Explanation
The correct option is "20 Watts". 20 Watts 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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