Monday, 2 May 2016

Why does an LED always need a resistor?




At school I was told "Never use a LED without a resistor (before or after the LED)!".


Why is that?


If I have a 2V LED why can't I simply use a 2V power supply?


Why should I choose a 3V (for example) power supply and put a resistor in front?


And how to calculate the resistor value?




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