Question detail

Which statement 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 the total energy used over time.
B. Power can be calculated using work done divided by time.
C. Power is the same as energy.
D. Power is measured in joules.

Answer

Power can be calculated using work done divided by time.

Explanation

The correct option is "Power can be calculated using work done divided by time.". Power can be calculated using work done divided by time. is right because it directly matches Power: Recall that 1 watt is equivalent to 1 joule per second.. 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

Confusing Power and Energy

Students often confuse power (watts) with energy (joules), thinking they are the same.

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

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