1. While you have measured the resistance of a resistor,
you can also use the color
of the stripes on a resistor
to approximate
the value of the resistor.

2. Grey
Gold
Silver

4. Example 1: The color stripes on a certain resistor are brown, black, red, and gold.
Ist stripe: brown 1
2nd stripe: black 0
3rd stripe: red 2
4th stripe: gold ± 5%
R = 10 X 102 = 10 x 100 = 1000 Ω
5% of 1000 Ω = 50 Ω
R should fall between 950 Ω and 1050 Ω.

5. Example 2: The color stripes on a certain resistor are yellow, violet, orange, and silver.
Ist stripe: yellow = 4
2nd stripe: violet = 7
3rd stripe: orange 3
4th stripe: silver = 10%
R = 47 x 103 = 47 x 1000 = 47,000 Ω
10% of 47 kΩ = 4700 Ω
R should fall between 42,300 Ω and Ω

6. Example 3: The color stripes on a certain resistor are brown, gray, brown, with no fourth stripe.
1st stripe: brown = I
2nd stripe: gray = 8
3rd stripe: brown = I
4th missing: 20%
R = 18 x 101 = 18 x 10 = 180 Ω
20% of 180 Ω = 36 Ω
R should fall between 144 Ω and 216 Ω.

7. That’s all Folks!