ECC Test 4 Practice 2025 - Complete Exam Prep

A yellow light at the breaker serves as an indicator, typically associated with the status of the breaker itself. When the breaker is open, it means that the circuit is not complete, and power cannot flow through it. The illumination of the yellow light in this case is a warning or signal to the user that the circuit is open and should be checked or addressed.

When a breaker is closed, power flows through it, and the yellow light is typically off, signaling normal operation without issues. If the breaker is in the off position, it may not illuminate because it is actively disconnected from the electrical circuit, functioning similarly to being open. A malfunctioning breaker could also lead to various indicators, but an illuminated yellow light specifically denotes the open state.

Thus, the yellow light indicating when the breaker is open is a useful feature that helps users identify electrical circuit conditions effectively, ensuring safety and maintenance of electrical systems.