Which of the following is accurate regarding step-down transformers?

Step-down transformers are specifically designed to decrease the voltage of an electrical supply while simultaneously increasing the current (amperage). This function is crucial in various applications, such as in radiography equipment, where a lower voltage might be required for specific components or processes while needing a higher amperage to maintain an adequate current flow.

This behavior is based on the principle of conservation of energy and the transformation ratio of the transformer. In a step-down transformer, if the voltage is reduced, the corresponding current increase will ensure that the total power output remains consistent (minus losses). Therefore, while the voltage is stepped down to safe operating levels, the increased amperage is necessary to deliver the same amount of power.

In the context of the question, the correct understanding of the operation of step-down transformers aligns precisely with the notion that they decrease voltage and increase amperage.