An operator will know when the master switch is on because a black indicator light will also be on.

Name: An operator will know when the master switch is on because a black indicator light will also be on.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The color black is typically not used for indicator lights because it would not be visible. Indicator lights are usually brightly colored (e.g., red, green, yellow) to be easily noticed when they are on or off.

An Operator Will Know When the Master Switch Is on Because