Why use resistors with leds - Why do I need a resistor when using LEDs on an Uno?
Why do we use resistors? [The real quick reasons]
led driver/resistor question
The most current that can possibly flow through the resistor will be 4.
longer running while consuming less current ignore the names, pics chosen just for showing general behaviour.
And I did the front the other day with 2 random resistors and when we put in a new 9v it fried the lights.
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