Question detail

Which of the following statements about power is true?

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. Power is measured in joules
B. Power is the same as energy
C. 1 watt is equivalent to 1 joule per second
D. Power cannot be calculated

Answer

1 watt is equivalent to 1 joule per second

Explanation

1 watt is defined as the rate at which energy is transferred, which is equivalent to 1 joule per second.

Common mistake

Power Ratings Comparison

Students often confuse power ratings with energy transferred, thinking that a higher power rating means more energy is transferred overall, rather than in a given time.

Clarify that power is the rate of energy transfer; a device with a higher power rating transfers energy faster, not necessarily more energy overall.

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