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Question

Which of the following statements are correct about power?

1. It is the rate of change of momentum.
2. It is the rate of change of force.
3. It is the rate of doing work.
4. The S.I. unit of power is watt.



A

Only 2 and 4  

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B

Only 1 and 4  

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C

Only 3 and 4  

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D

Only 1, 3 and 4  

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Solution

The correct option is C

Only 3 and 4  


Power is defined as the rate of doing work. 
Mathematically power is expressed as Power=Work doneTime taken
The S.I. unit of power is joule per second, which is equal to watt. So, only statements 3 and 4 are true.


Physics

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