Question 1
Question detail
How can you calculate power if you know the work done and the time taken?
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 = work done x time
- B. Power = work done / time
- C. Power = time / work done
- D. Power = work done + time
Answer
Power = work done / time
Explanation
Power can be calculated using the formula power = work done / time, indicating how much work is done per unit of time.
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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