Physics for IGCSE & O level - Magnets And Currents (Section 11 - No. 38)
In a transformer, the ratio of the number of turns in the primary coil to the number of turns in the secondary coil determines:
The frequency of the a.c.
The voltage ratio.
The current ratio.
The resistance.
Explication
The voltage ratio is determined by the number of turns in the coils.