Registered Electrical Engineering Licensure Practice Exam

The definition of an open circuit centers on the concept of continuity in an electrical path. An open circuit is characterized by a break or interruption that prevents current from flowing through the circuit. This interruption could be due to a switch being turned off, a broken wire, or any other disconnection in the circuit path. As a result, because the circuit is incomplete, no electrical current can pass through, and thus the circuit is said to be "open."

In contrast, a closed circuit is one that is complete with no interruptions in the path; therefore, current can flow freely. This distinction is fundamental in understanding how electrical systems operate, as the functionality largely depends on whether the circuit is open or closed.

Other choices may seem plausible but do not accurately depict the core distinction between an open and closed circuit. For instance, grounding and energy storage concepts do not directly relate to the fundamental definition of what constitutes an open versus a closed circuit. Understanding this core principle is crucial for grasping advanced electrical theories and applications.