Transformers act sort of like gears in a transmission
Changing the current, and voltage by adjusting the primary and secondary windings like gear ratios
There are 2 types stepup and stepdown
*Step-up
(low voltage,high current)=(high voltage,low current)
the Primary winding has few turns and the Secondary has many
*Step-down
(high voltage,low current)=(low voltage,high current)
the primary winding has many turns and the secondary has few
Here are the formulas for finding the voltage and currents of the transformation
Secondary Current=Primary Current(primary turns/secondary turns)
Secondary Voltage=Primary Voltage(secondary turns/primary turns)