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Most LEDs have one lead longer than the other, or a flat side on the rim of the

base, to indicate polarity. An LED that has neither of these must be marked in

some other way.

The only way to identify the polarity of an unmarked LED is to test it. A common AA

or C battery in series with a small resistor of 50-100 ohms will do the job.

The LED lights when the positive end of the battery ... possibly through the resistor ...

goes to the positive end of the LED. (There is no harm to the LED when the battery is

connected backwards and the LED doesn't light.)

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Q: How do you tell the positive from the negative on a led?
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