LEDs is the small light which is used in the lab to know that the electric is moving in the lab and LEDs are commonly used for indicator lamps and you must use a small voltage so it doesn't breakdown. There are two types of LEDs one way is a + and another way is – and the longer way is +.

There are a lot of colours for LEDs but this is only to give you a design. thumbnail.aspx?q=1545618338566&id=1673341660a1fb9527bc725cf2ed3c0d
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