In electrical circuits, it refers to the presence of an unbroken path for current to flow. It signifies that a complete circuit exists from one point to another, allowing electricity to pass unimpeded. A simple illustration is a closed switch in a circuit powering a light bulb; the bulb illuminates because a complete path exists.
Establishing and verifying this characteristic is essential for ensuring proper operation and safety in electrical systems. It allows technicians to diagnose faults, prevent hazards like short circuits, and ensure components receive the necessary power. Historically, its confirmation was a manual process, but modern testing equipment streamlines the task, improving accuracy and efficiency.
