28125 Parallax Inc, 28125 Datasheet - Page 323

• Manufacturer Part Number: 28125
• Description: TEXT ROBOTICS
• Manufacturer: Parallax Inc

Specifications of 28125

• Title: Robotics with the Boe-Bot
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable

Appendix C: Resistor Color Codes
Resistors like the ones we are using in this student guide have colored stripes that tell you
what their resistance values are.
resistance value. For example, the color code for the 470 Ω resistor is yellow-violet-
brown.
There may be a fourth stripe that indicates the resistor’s tolerance. Tolerance is measured
in percent, and it tells how far off the part’s true resistance might be from the labeled
resistance. The fourth stripe could be gold (5%), silver (10%), or no stripe (20%). For
the activities in this book, a resistor’s tolerance does not matter, but its value does.
Each color bar that tells you the resistor’s value corresponds to a digit, and these
colors/digits are listed in Table C-1. Figure C-1 shows how to use each color bar with the
table to determine the value of a resistor.
Here is an example that shows how Table C-1 and Figure C-1 can be used to figure out a
resistor value by proving that yellow-violet-brown is really 470 Ω:
•
•
Digit
Resistor Color Code
First stripe is yellow, which means leftmost digit is a 4.
Second stripe is violet, which means next digit is a 7.
0
1
2
3
4
5
6
7
8
9
Table C-1:
Values
Color
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Gray
White
First Digit
There is a different color combination for each
Second Digit
Number of Zeros
Tolerance
Code
Figure C-1
Resistor Color
Codes