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How To Use LED's

Step 2More Important Information

More Important Information
Another important thing about all LED's (and all diodes) is that every one of them has exactly two electrodes. These are important to know when you are wiring an LED into a circuit. They are the...

Anode - The p-side which is the longer leg. And the...

Cathode - Which is the n-side and shorter leg.

Since you know these terms you can remember that electricity flows easily from the anode to the cathode but not the other way around.
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3 comments
Dec 23, 2008. 4:58 AModonnghaille says:
You can also tell the Cathode by the flat rim as oppose to the curve on the plastic above the legs.
Jun 4, 2009. 6:22 AMskrubol says:
Also, generally if you can see the interior of the LED, the cathode is usually attached to the cone shaped mirror part. Neither of these are rules though, and I've seen LED's in similar packages with no flat, and with the anode connected to the mirror.

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