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

Capacitors are rated in both microfarads and volts, which makes this the best answer. Microfarads indicate the capacitance value, representing the ability of the capacitor to store an electrical charge. The volt rating, on the other hand, indicates the maximum voltage that can be applied to the capacitor before it may fail.

Understanding these two ratings is crucial for ensuring that a capacitor is used within its specified limits to prevent breakdown and failure. The capacitance value, measured in microfarads, determines the amount of charge it can store, and this is essential for applications like timing circuits, filtering, and energy storage. Meanwhile, the voltage rating ensures safety and reliability in circuits where they may be subjected to varying voltage levels.

The other options, including amperes and just focusing on one of the ratings (either microfarads or volts), do not fully encapsulate the necessary specifications needed for capacitors.