Can the loop transformer adjust the current size?

A ring type transformer is a static electrical device. It works on the basis of the principle of electromagnetic induction. It converts a grade of AC voltage to another level of voltage and current of the same frequency. Its function is to transform AC voltage, transform AC current and transform impedance. Can the transformer adjust the size of the current? The answer is no, the transformer can not regulate the current size, but it can be used to transform alternating current.
How can this be understood? The adjustment and transformation will also change. How can it be said that the transformer can be used to transform the AC current, but can not adjust the size of the current? Below is a detailed explanation of this issue.
The transformation is relatively fixed, the scope of change is small, and the regulation is arbitrary. For example, the 350W ring transformer, the input voltage 220V, the output voltage 110V, the input current I=P/U=1.59A, the output current I=P/U=3.18A, the current from 1.59A to the 3.18A. However, the regulation is arbitrary, and the transformer can not be adjusted arbitrarily.