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101.
If the transformer to the right must supply 45.0 v and 9.00 amps at the secondary coil, what must be provided to the primary coil?

A.   15.0 v at 3.00 amps
B.   15.0 v at 27.0 amps
C.   135 v at 3.00 amps
D.   135 v at 27.0 amps
    
Step up transformers have more turns in the secondary coil than the primary coil.  The transformer above has 15 turns in the secondary coil to 5 turns in the primary coil.
      

Vprimary       Vsecondary 
------------- = ---------------
Nprimary       Nsecondary  

     
                       Vprimary  x Nsecondary        45.0 volts x  15 turns
Vsecondary = -------------------------------- = --------------------------------- =  135 volts
                                  Nprimary                               5 turn

        
Pprimary  =  Psecondary       P = IV

IprimaryVprimary  =  IsecondaryVsecondary  

     
                     IprimaryVprimary      9.00 amps x 45 volts
Isecondary = ----------------------- = ----------------------------- =  3.00 amps   The Correct Answer is C.
                          Vsecondary                     135 volts 

                                     

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