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Flow of electric charge - typically movement of charge carriers, such as electrons. Measured in amperes (A).

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Red,yellow leds usually need only 1.8-2V to glow depending on the led. so you need to use a resistor in series based on your brightness requirements. this forward voltage needed depends on the led. for red, I suggest around 20mA current which will give you a resistance of 50ohms. …
answered Oct 21 '18 by Ashlesh Bhat