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Circuitbuilding and Resistor Color Codes

By H. Ward Silver

Part of Circuitbuilding Do-It-Yourself For Dummies Cheat Sheet

Resistors are common passive electronic parts (meaning they don’t need power to run) for circuitbuilding. Resistors control currents and voltages and they’re manufactured in a variety of ways. Use this table to read resistor color codes for circuitbuilding:

Color Value Stripe Multiplier Stripe Tolerance Stripe
Black 0 times; 1 (100)
Brown 1 times; 10 (101) 1%
Red 2 times; 100 (102) 2%
Orange 3 times; 1000 (103)
Yellow 4 times; 10,000 (104)
Green 5 times; 100,000 (105) 0.5%
Blue 6 times; 1,000,000 (106) 0.25%
Violet 7 times; 10,000,000 (107) 0.1%
Gray 8 times; 100,000,000 (108) 0.05%
White 9 times; 1,000,000,000 (109)
Gold times; 0.1 5%
Silver times; 0.01 10%
No color 20%