Physics for IGCSE & O level - Magnets And Currents (Section 9 - No. 1)
In a transformer, the ratio of output voltage to input voltage is equal to the ratio of :
Input current to output current
Number of turns in secondary to primary coil
Number of turns in primary to secondary coil
Input power to output power
Forklaring
This is a core principle of transformer operation, with the voltage ratio matching the turns ratio.