What happens if a LED is connected in reverse, if LED is connected in reverse meaning anode and cathode swapped so positive to cathode and negative to anode, LED will not light up because LED is diode that allows current only in forward direction from anode to cathode, with reverse connection blocking current flow, so LED remains off, no light. In most cases with low voltage like 5 volts or less, LED will not be damaged immediately, as diode blocks reverse current, and when polarity corrected it will work normally, as LEDs can tolerate small reverse voltage up to about 5 volts reverse breakdown voltage. However, if reverse voltage is higher than reverse breakdown voltage, typically around 5 volts for standard LEDs, LED can be permanently damaged, with reverse breakdown causing excessive current in reverse direction that can destroy PN junction, leading to LED failure and never lighting even with correct polarity afterwards. For LED strips or bulbs with built in driver, reverse connection usually causes no light but driver may have protection preventing damage. So what happens if LED connected in reverse, it will not light, may be undamaged if low voltage and short duration, but can be damaged if high reverse voltage applied, requiring polarity correction to make it work, with correct connection being long leg anode to positive.
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