Question detail
A circuit transfers 240 J of energy in 5 s. Which answer correctly identifies the power and the method used?
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. 48 W, because power is work done or energy transferred divided by time
- B. 240 W, because energy is copied directly as power
- C. 5 W, because time alone sets the power
- D. 1200 W, because energy and time are multiplied
Answer
48 W, because power is work done or energy transferred divided by time
Explanation
The correct option is "48 W, because power is work done or energy transferred divided by time". It is right because power = work done � time, so 240 J � 5 s = 48 W. The other options either copy one value, use time alone or multiply instead of dividing.
Common mistake
Common Mistake in Energy Calculation
Students often confuse the work done by current flowing with the energy transferred, leading to incorrect calculations.
Ensure to use the correct formula for calculating energy changes, specifically relating work done to the energy transferred in the system.
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