Ask a Teacher

1. It increases  the a.c. voltage and  decreases the current.  

2. The turns ratio  N_s/ N_p > 1.  that is, it  has  more number of turns in the secondary coil than in the primary coil.

3. The wire of primary coil is thicker than that in the secondary coil.

4. Uses:At power generating  station, with X- ray tubes, television, etc. 

1. It increases  the a.c. voltage and  increases the current. 

2. Its  turn ratio N_s/N_p < 1that is, it has less number of turns in the secondary coil than in the primary coil.

3.The wire in the secondary coil is thicker than that in the primary coil.

4. Uses:  At power substation, with night electric bulb,  radio sets for valve heaters, transistors etc.