Final answer:
A transformer with a primary voltage of 12000 is a Step-Down Transformer, where the voltage decreases from the primary winding to the secondary winding.
Step-by-step explanation:
A transformer nameplate with a primary voltage of 12000 indicates a Step-Down Transformer. In a step-down transformer, the number of turns in the secondary coil is greater than the number of turns in the primary coil. This leads to a decrease in voltage from the primary winding to the secondary winding.