![]() ![]() However, after 20 years there is no electronic package that contains both a Transistor and a Diode. In this instructable, I will show you 5 ways to determine LED polarity. A Anode K Cathode (because 'C' was reserved for Collector) It was forecasted that someday in the future a Transistor and a Diode or LED would reside in the same package and the alphanumeric pins would be assigned logically. ![]() So polarity is very important as you can see. The lead connected to the positive terminal of battery is called anode and the lead connected to the negative terminal is cathode. Connecting it the other way may damage it, it may even explode (electrolytic capacitors) or your circuit will just not work properly. Polarized component means that it has to be connected in a specific way in order to work. Complete step by step answer: We know that LED has two terminals. The LED is provided with longer and shorter leads for their identification. Cathode is connected to the negative terminals of the battery and anode is connected to the positive terminal of the battery. In electronics you can find various components, we can divide them into polarized ones (LEDs, electrolytic capacitors, transistors, microcontrollers and many others) and ones that don't have polarity (resistors, coils and other). Hint:LED is provided with two terminals: cathode and anode. The forward current goes into the longer lead (anode). I want to talk about even more basic thing: checking the LED polarity. This red LED (light emitting diode) does not have a stripe, but instead has wire leads of different length. Of course, usually you need to use a resistor in order to limit the current and avoid burning your LED, but that's not what I am going to write about in this instructable. If you already used them in a project or unsoldered them. One of the most important factor to use them properly is to connect them the way they should. Thats the easiest way to check LED polarity, at least if you have brand new LEDs. LEDs are probably the most-liked elements by all beginners maybe even by everyone involved in electronics projects. ![]()
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