February 12, 2017 Aniruddha
What is LED?
LED or Light Emitting Diode is an electronic component that emits light when current passes through it in one direction. It will not allow the current to pass through in the other direction.
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| Fig 1. Standard Green, Yellow, Red LED |
If a current more than its threshold is applied to it in either direction, the LED will burn out.
How to identify the correct direction of the current flow.
LED has two leads, usually of different length, The longer lead is called the anode (+ve) and the shorter leg is called cathode (-ve). On a circuit the LED should be assembled such that the current enters from the anode and exits through the cathode.
Another way to identify a standard LED is look the LED from the top. The anode is of the smaller width than the cathode. If you look an LED from the side you can see an arrow in which the current can flow.
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| Fig. 2 From top to bottom: Top view, Side view and symbol for LED |
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