Step up transformers step the voltage up. They have more turns on the secondary coil than the primary.
Step Down Transformers step the voltage down.They have more turns on the primary coil.
The primary coil produces a magnetic field which stays within the magnetic core.
The AC current means the magnetic field in the core is constantly changing, which induces an AC current in the secondary coil.
The number of turns decides whether the voltage induced in the secondary is greater or less than that in the primary coil.
Using DC would mean no current in the secondary coil as there would be no changing field to induce the current.
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