electrical power transmission & distribution

PLUS TWO RESULT



C. O . TO IDENTIFY III PHASE A C AND  I PHASE AC , TRANSMISSION OF POWER and DISTRIBUTION OF ELECTRICITY.


                                                                                   
ACTIVITY-1
           Write true or false? Correct the false statements,if any?


           1)In  Three phase  generator, for each field magnet (field coil),three   identical coils           are placed
           2)In Single phase generator,for each field magnet (field coil),three   identical coils are placed
           3)In  Three phase  generator, ,three pair of   coils   produced three different voltage        
           4)In  Three phase  generator, for each field magnet (field coil),three  identical coils                are placed   in 60  degrees.
           5)In  Three phase  generator, there is only phase difference in out put voltage.
           6) Step up transformer is used as street transformer.


ACTIVITY-2
           
          Some boys are playing cricket under power transmission tower.One of them pointed the four  transmission lines of the tower and said ,"look that separate  below line, it is neutral line."
          
           1)In what voltage electricity produced in power station?
           2)Do You agree with the statement of the boy?substantiate your answer?
           3)Why thick almanium wire is used for transmission line?


Assignments
           1) Draw graph of III phase A C in chart paper? 
            2) What are the drawbacks of power transmission ? How it minimize it?
            3)Why electrical power  is transmitted in A C ?
            4)Write energy change taking place in the following power stations?
                    a)Kalppakkam Power  house
                    b)Shabarigiri power house
                    c)Kayamkulam powerstaton
           5)In star connection voltage of a phase line is 230V.But voltage between two phase line is 400V.Prove it mathematically.
VIDEO
A C GENERATOR


threephase generator


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Making It Real: Incorporating Physics in Video Games project, students are guided in using the ExtremePhysics engine .


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