What is an open circuit?

An open circuit is best defined by the presence of a break in continuity that prevents current from flowing. In a functional electrical circuit, electrical current requires a complete path through which it can travel. When this path is broken, whether due to an intentional design (like a switch being turned off) or an unintentional fault (like a broken wire), the circuit becomes "open," and no current can flow.

This characteristic is fundamental in understanding basic electrical concepts because it highlights the necessity of a closed loop for current to effectively power devices. In contrast, the other definitions do not apply to an open circuit, as they describe scenarios where current can flow, either continuously or under certain conditions, which is contrary to the nature of an open circuit.