Just to insert a little confusion here. [Linked Image]
You cannot get get out of of the Secondary side of the Transformer, what you put in the Primary side.
In a 100% efficient Transformer, you will get out what you put in.
But Transformers have nasty things like Iron Losses, Copper Losses and even things like Hysteresis (Magnetising Current) Losses.
The losses are quite minimal, but they have to be taken into account.