What happens when you reverse polarity on an LED? - Quora

Answer (1 of 8): Leds being diodes, will only allow current to flow in one direction. And when there’s no current-flow, there’s no light. luckily, this also means that you can’t break an led by plugging it in backwards. A reversed LED can keep an entire circuit from operation properly by blocking

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LED indicator circuit for reverse polarity : r/AskElectronics

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What happens if battery polarity is reversed? - Quora

What happens when the polarity of a wire is reversed? - Quora

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