6.17

·         6.17 recall the structure of a transformer, and understand that a transformer changes the size of an alternating voltage by having different numbers of turns on the input and output sides

 

 

6.17 Practical - model answers

17 January 2012

14:33

·         If you…

·         Turn the powerpack to dc

No current is induced in the Secondary Coil.  To induce current you need a changing magnetic field and this is not produced by applying dc to the Primary Coil

·         Turn the powerpack to ac

ac is induced in the Secondary Coil.  To induce current you need a changing magnetic field and this is produced by applying ac to the Primary Coil

3.  Increase the number of turns in the Secondary Coil

The size of the induced voltage in the secondary coils increases

4.  Increase the voltage on the Primary Coil

The size of the induced voltage in the secondary coils increases

5.  Decrease the number of turns in the Secondary Coil

The size of the induced voltage in the secondary coils decreases

6.  Decrease the voltage on the Primary Coil

The size of the induced voltage in the secondary coils decreases