Which of the following statements about electrical systems is correct?

The statement that an open circuit contains an interruption in current flow is accurate because an open circuit is defined by the fact that there is a break or gap in the path through which electric current normally flows. This means that the circuit is incomplete, resulting in no current passing through the circuit.

In practical terms, when a switch is open, for example, the contacts do not connect, thus preventing electricity from flowing. This concept is fundamental in understanding how circuits function, whether they are simple or complex. It highlights the importance of continuity in electrical systems.

The other statements are misleading: the efficiency comparison between open loop and feedback systems is context-dependent and cannot be generalized; feedback systems actually do employ methods to control variables; and a closed switch creates a closed circuit, not an open one. Understanding these distinctions is crucial for grasping how electrical systems operate.