Exam-style question
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If a device consumes 1500 J of energy in 30 seconds, what is its power consumption?.
- A.50 W
- B.75 W
- C.100 W
- D.150 W
Model answer
What a good answer should say
- 50 W.
- the correct option
Explanation
Why this works
The correct answer is 50 W. This supports Calculate power as the rate of energy transfer.
in Work, energy and power because it uses the required mechanics relationship directly. The other options are less suitable because they confuse a different force, motion, energy, momentum, or materials concept.
Common mistake
No common mistake is linked to this question yet.