A step-up transformer increases voltage (potential difference) while simultaneously decreasing the current (amperage) of an alternating current (AC) circuit. It achieves this because the secondary coil has more turns of wire than the primary coil.

A step-down transformer decreases voltage (potential difference) while simultaneously increasing the current (amperage) of an alternating current (AC) circuit. It achieves this because the secondary coil has less turns of wire than the primary coil.

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