11xph2
St B  
On this page you will find activities and links that will hopefully help you do as well as possible in your Physics* work and examinations.
* and perhaps some Chemistry and Biology.

Answers for Friday 24th HW sheet
Transformer calculations answers:

1 a) STEP UP  ; C  D  G  H   b) STEP DOWN ; A  B  E  F



2.     _Vs_  =  _30s_    so :   Vs = 230 x 0.05 = 11.5V          

         230p       600p                                                           

3.    Vs   =    2400s         so Vs = 230 x 4 =  920V 

      230p       600p



4.   30s    =   Ns              so Ns = 460 x 0.130   = 60 turns

     230p       460p



5. We want   230s  =     ?s    so any pair with same ratio! E.g             Ns 230  

                    110p         ?p                                                             Np 110

                                                                                    or Ns 460

                                                                                        Np 220  etc

                                                          (Ns x 0.47 =Np

                                                           Np x 2.09 =Ns)
My Quia activities and quizzes
Electricity and Magnetism
https://www.quia.com/cm/122795.html
Electrical circuits terms
https://www.quia.com/jg/2843606.html
Materials. Metals reactivity series
https://www.quia.com/rd/4660.html
unit 2 learn the chemistry
https://www.quia.com/jg/873956.html
Useful links
Last updated  2022/10/12 11:06:39 PDTHits  98