Transformers involve the use of electromagnetic induction so they will only work on AC. There are 'step-up transformers' and 'step-down transformers'. Both types of transformer have primary and secondary coils joined on an iron core.
No electricity flows round the iron core it's because it's magnetic. That's why insulated wire is used; otherwise it would short circuit.
Transformers work as the primary coil produces an alternating magnetic field by the alternating current, this then induces an AC voltage in the secondary coil.
The transformer equation
Primary Voltage = Number of turns on primary
Secondary Voltage Number of turns on secondary
Transformers only work with AC!!
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