In a control circuit, what does a yellow indicator lamp typically signify?

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Multiple Choice

In a control circuit, what does a yellow indicator lamp typically signify?

Indicator lamps in control circuits are used to give a quick visual read of what part of the system is active. The yellow lamp in this convention is used to show that an output device is energized—the control logic has closed a relay or activated a actuator, so power is being delivered to the load. It’s not signaling an input signal, which would reflect sensor status, nor is it indicating main power presence (that's usually shown with a different color or indicator), and alarms are typically distinguished by a color like red. So the yellow lamp specifically communicates that the output is active.

Indicator lamps in control circuits are used to give a quick visual read of what part of the system is active. The yellow lamp in this convention is used to show that an output device is energized—the control logic has closed a relay or activated a actuator, so power is being delivered to the load. It’s not signaling an input signal, which would reflect sensor status, nor is it indicating main power presence (that's usually shown with a different color or indicator), and alarms are typically distinguished by a color like red. So the yellow lamp specifically communicates that the output is active.

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