How to Identify the Positive and Negative Leads of a LED

Learn how to easily determine the positive and negative leads of a LED with these simple tips.

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To determine the positive (anode) and negative (cathode) leads of a LED, look at the length of the leads; the longer lead is usually the positive one. Another method is to inspect the inside of the LED; the smaller metal component inside is typically on the positive side. If the leads have been trimmed, you can also look at the flat spot on the plastic casing of the LED, which usually indicates the negative side.

FAQs & Answers

  1. How can you tell which LED lead is positive? The longer lead of the LED is typically the positive one (anode).
  2. What does the flat spot on an LED indicate? The flat spot on the plastic casing of the LED usually indicates the negative side (cathode).
  3. What should you do if the LED leads have been trimmed? If the leads have been trimmed, inspect the inside of the LED; the smaller metal component inside is usually on the positive side.
  4. Can LED orientation affect its performance? Yes, connecting an LED in reverse polarity can prevent it from lighting up, possibly damaging the LED.

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