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Question

Which of the following statement(s) is/are correct about power?

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


  1. only 1,3 and 4  

  2. only 2 and 4  

  3. only 1 and 4  

  4. only 3 and 4  


Solution

The correct option is A

only 1,3 and 4  


Power is defined as the rate of doing work. If  'W' work is done in total time 't', then Power, P = Wt
The S.I. unit of power is watt which is equal to joule per second.

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