Question detail
A car engine does 30000 joules of work in 60 seconds. What is the power output of the engine?
Try the question, check the answer, then read the explanation to understand the curriculum point.
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. 500 W
- B. 600 W
- C. 700 W
- D. 800 W
Answer
500 W
Explanation
The correct option is "500 W". 500 W is right because it directly matches Power: Identify power in watts, energy transferred in joules, work done in joules and time in seconds.. 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 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.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.