In a step-up transformer, the number of turns of wire in the secondary winding is greater than that in the primary winding. According to the fundamental principle of electromagnetism, the voltage induced in a coil is proportional to the number of turns.

In a step-up transformer, the number of turns of wire in the secondary winding is greater than that in the primary winding. According to the fundamental principle of electromagnetism, the voltage induced in a coil is proportional to the number of turns. Therefore, if the secondary winding has more turns, the output voltage will be higher than the input voltage, while the output current will be proportionally lower (assuming ideal conditions with no losses).
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