Electronics — Resistor Color Code Reference
Electronics — Resistor Color Code Reference Color Code Table Reading a 4-Band Resistor [1st digit] [2nd digit] [multiplier] [tolerance] Example: Red Red Brown Gold = 2 2 x10 ±5% = 220Ω Common Values Ohm's Law LED Resistor Formula R = (Vsupply - Vforward) / Idesired Example: 5V, red LED (Vf=2V), 20mA → R = (5-2)/0.02 = 150Ω Typical Vf: Red 2V, Yellow/Green 2.2V, Blue/White 3.2V Links Digikey resistor color code calculator All About Circuits
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