Question detail
If a device transfers 2400 J of energy in 60 seconds, what is its power rating?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Energy changes in a system, and the ways energy is stored before and after such changes
Question
If a device transfers 2400 J of energy in 60 seconds, what is its power rating?
Answer
40 W
Explanation
This question requires the application of the power formula, testing the ability to calculate power from energy transferred and time. This answer is linked to Power because it applies the learning objective: Identify power in watts, energy transferred in joules, work done in joules and time in seconds.. It shows the Physics relationship clearly and keeps energy, power, work done and efficiency terms distinct where they appear.
Common mistake
Confusing Units of Power
Students often confuse watts with joules, thinking they are the same unit.
Remember that watts measure power (rate of energy transfer), while joules measure energy. 1 watt is equivalent to 1 joule per second.
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