Power
Power is the rate of doing work or the rate of energy transfer.
Practice This ConceptMain explanation
Teacher explanation
Power tells how quickly work is done. Two people may do the same work, but the one who completes it in less time has greater power. Its SI unit is watt, where 1 watt means 1 joule of work done per second.
Example
If two motors lift the same load to the same height but one takes less time, that motor has greater power.
Simple analogy
Power is work speed.
Common confusion
Students often think more power always means more total work, but power also depends on time taken.
Exam tip
For comparison questions, first check whether work done is same or different, then compare time.
Answer writing and exam use
1-mark use
Write the exact meaning of power in one clean line.
2-mark use
Define power and add one example or condition.
3-mark use
Explain power, show the method or example, and mention the common mistake.
Practice this concept with focused MCQs
Open the concept quiz intro first, review the test details, and then start a focused MCQ set from this concept only. Instant score and answer review are live now.
Help improve this page
Found something confusing, incorrect, or missing?