A Step Up transformer _____________. how ?

Ans: Step Up the level of Voltage & Step down the level of current

A Step up transformer only step up the level of voltage and step down the level of current.

Because the input power is same.

So according to P=VI→ I = P/V…. We can see that, when Voltage increases, current decreases.

So in Step up transformer, input power is same, therefore, when voltage increases, then current decreases.