Appendix E Resistor Color Code

Most common types of resistors have colored bands that indicate their value. The resistors that we're using in this series of experiments are typically "1/4 watt, carbon film, with a 5% tolerance". If you look closely at the sequence of bands you'll notice that one of the bands (on an end) is gold. This is band #4, & the gold color designates that it has a 5% tolerance.

The resistor color code is an industry standard in recognizing the value of resistance of a resistor. Each color band represents a number and the order of the color band will represent a number value. The first two color bands indicate a number. The third color band indicates the multiplier or in other words the number of zeros. The fourth band indicates the tolerance of the resistor +/- 5, 10 or 20 %.

Color

1st Digit

2nd Digit

Multiplier

Tolerance

black

O

O

1

brown

1

1

1O

red

2

2

1OO

orange

3

3

1.OOO

yellow

4

4

1O.OOO

green

5

5

1OO.OOO

blue

6

6

1.OOO.OOO

violet

l

l

1O.OOO.OOO

gray

B

B

1OO.OOO.OOO

white

g

g

1.OOO.OOO.OOO

gold

5%

silver

1O%

no color

2O%

A resistor has the following color bands:

Band #1. = Red Band #2. = Violet Band #3. = Yellow Band #4. = Gold

Looking at our chart above, we see that Red has a value of 2.

So we write: "2". Violet has a value of 7. So we write: "27"

Yellow has a value of 4.

So we write: "27 and four zeros" or "270000".

This resistor has a value of 270,000 Qs (or 270KQ) & a tolerance of 5%.

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