CDC Power Pro Practice Test: Comprehensive Practice Exam & Study Guide

The appropriate choice is based on the function and design of a potential transformer. Potential transformers are specifically designed to step down high voltages to lower levels that are suitable for measurement and metering purposes. They utilize two inductors, which are coupled magnetically to each other. This configuration allows for the transformation of voltage through electromagnetic induction.

The primary winding, connected to the high-voltage line, creates a magnetic field when current flows through it. This in turn induces a proportional voltage in the secondary winding, allowing for accurate voltage measurement and monitoring. This two-inductor setup is fundamental to the operation of a potential transformer, as it allows efficient voltage transformation while maintaining isolation from the high-voltage circuit for safety.

In contrast, the other options do not typically employ two inductors in the same manner or context. Resistive transformers mainly utilize resistive elements for their operation. Current transformers focus on measuring current and usually consist of a single primary winding and a secondary winding configured differently than potential transformers. Capacitive transformers are designed to measure voltage using capacitive coupling rather than inductive coupling. Thus, the structure and function of potential transformers distinctly make them the correct choice for a type of transformer that uses two inductors.