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Getting Started with Intel Galileo by Matt Richardson

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Appendix C. Resistor Reference

If you’re doing basic hobby electronics, you’ll typically use resistors with four color bands. The first three bands indicate resistance in ohms, according to Table C-1. The fourth band indicates tolerance, which will usually be gold (5%) or silver (10%), but could also be brown (1%) or red (2%).

The tolerance of the resistor indicates the possible amount of variance between the indicated value and the actual value of the resistor. If no tolerance is indicated, it’s assumed that it’s 20%.

Table C-1. Basic four-band resistor reference
Color First BandSecond BandThird Band (Multiplier) Fourth Band (Tolerance)

Black

0

0

x1

Brown

1

1

x10

1%

Red

2

2

x100

2%

Orange

3

3

x1K

Yellow

4

4

x10K

Green

5

5

x100K

Blue

6

6

x1M

Purple

7

7

x10M

Gray

8

8

White

9

9

Gold

5%

Silver ...

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