Question detail

What does it mean for two devices to have different power ratings despite transferring the same amount of energy?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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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. They operate at different voltages.
B. One device transfers energy faster than the other.
C. They have different energy sources.
D. One device is more efficient than the other.

Answer

One device transfers energy faster than the other.

Explanation

The correct option is "One device transfers energy faster than the other.". One device transfers energy faster than the other. is right because it directly matches Power: Explain why two devices can transfer the same amount of energy but have different powers if one transfers it faster.. The other options are less suitable because they change the required Physics relationship, confuse the relevant energy store or use a distractor that does not answer the question.

Common mistake

Misunderstanding Power

Students often think that power is the total amount of energy transferred, rather than the rate at which energy is transferred.

Emphasize that power is defined as the rate of energy transfer, and clarify that two devices can transfer the same energy but have different power ratings based on how quickly they do so.

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