Exam-style question
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A heater transfers 7200 J of energy in 60 seconds. What is the power output of the heater?.
- A.120 W
- B.100 W
- C.150 W
- D.200 W
Model answer
What a good answer should say
- 120 W.
- the correct option
Explanation
Why this works
The correct answer is 120 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.