Question detail
A device transfers 5000 joules of energy in 25 seconds. Calculate the power of the device.
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
A device transfers 5000 joules of energy in 25 seconds. Calculate the power of the device.
Answer
200 W
Explanation
This question tests the ability to apply the power formula, P = E/t, to calculate the power of a device based on energy transferred and time taken. This answer is linked to Power because it applies the learning objective: Rearrange power equations to calculate energy transferred, work done or time.. It shows the Physics relationship clearly and keeps energy, power, work done and efficiency terms distinct where they appear.
Common mistake
Common Mistake in Rearranging Power Equations
Students often confuse the formulas for power, energy transferred, and work done, leading to incorrect rearrangements.
To correctly rearrange the power equations, remember that power (P) can be calculated as P = energy transferred (E) / time (t) or P = work done (W) / time (t). Ensure you isolate the variable you need by multiplying or dividing appropriately.
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