Nate Electrical Practice Exam 2025 - Free Electrical Practice Questions and Study Guide

In a series circuit, all components are connected one after the other in a single path for current to flow. This configuration ensures that the same current flows through each component. Since the current is consistent, the total voltage supplied by the power source is divided among the components, resulting in the same voltage drop across each component based on their resistance.

In contrast, in a parallel circuit, each component is connected directly across the same voltage source, and while all components experience the same voltage from the source, the components do not share voltage in the same way as in a series circuit; rather, each has an independent voltage path. An open circuit cannot be considered, as it does not permit current flow, and thus does not provide a consistent voltage across components. Similarly, while transformers operate with alternating current and transform voltage levels based on windings, they are not pertinent to the question about uniform voltage across components.

Therefore, in a series circuit, the requirement that all components maintain the same voltage effectively applies to the entire circuit behavior, which is why this configuration is the correct answer.