Why does every LED need a resitor - General Electronics - Arduino Forum
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arduino uno - Do I need a pull-up/down resistor for button LED circuit? - Arduino Stack Exchange
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LED Resistor Calculator
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Why do LEDs need resistors? - Electronic Guidebook
Why do you need a current limiting resistor to drive an LED if the LED draws only as much current as it requires? - Quora
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Basics: Picking Resistors for LEDs | Evil Mad Scientist Laboratories
Is a lightbulb in a circuit considered a load or a resistor? - Quora
How to Select a Resistor for an LED - Another Teaching Moment | DigiKey Electronics - YouTube
Which Resistor to Use with this LED? | Electronics Repair And Technology News
Choosing the Resistor to Use With LEDs : 3 Steps - Instructables
Guide to LEDs and resistors
Resistors for LED Circuits | Resistor Applications | Resistor Guide
When and Why do LEDs Need Current Limiting Resistors? | Waveform Lighting
