Power and measuring it

Power and measuring it - POWER Presentationby K.RAJAIAH...

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POWER      Presentation  by K.RAJAIAH
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                              AGENDA 2
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          INTRODUCTION 11/09/11 3 RGUIIIT BASAR WORK :   The work done by the the force is defined to be the product of                                               component of the force in the direction of the  displacement and the magnitude of this displacement.  Thus    Often it is interesting to know not only the work done on an object,  but also the rate at which this work is done.   For example, a person takes an abnormally long time to  elevate his body up a few meters along side of a cliff. On the other hand another person  might elevate his body  in a short amount of time. The two persons might do the same amount of  work but the second person does the work in less  time than the first person.
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                                    Example 2       Imagine two cars of same mass but different engines.  Both the cars climb roadway up a hill. But one car takes  less time where as another one takes more time to reach  the top. So it is very interesting to know not only the  work done by the vehicles but also the rate at which it is  done. 11/09/11 4 RGUIIIT BASAR
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11/09/11 5 RGUIIIT BASAR                                        Example 3     To extinguish the fire in a building water is to be lifted  up and sprayed on the fire as fast as possible. The  fastness will be depend on the motor used to lift the  water i.e, at what rate it is lifting the water( or doing the  work). 
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                                 DEFINITION POWER :- The rate of doing work is called as power.                                   or                  The rate at which work is done or energy is                                 transferred is called as power. 6 Like work and energy, power is a scalar quantity.
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7 DEFINITION  &  APPLICATIONS
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POWER When a quantity of work      is done during a time interval                        , the average work done per unit time or  average  power  is defined to be       We can define the instantaneous power as the limiting  value of the average power as     approaches to zero.  
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Power and measuring it - POWER Presentationby K.RAJAIAH...

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