Working with Resistor Color Bands

Today, in PAE, we did a lab where we were looking at resistor color bands.

With this particular resistor, we have color band 1 is green, color band 2 is violet, color band 3 is red, and color band 4 if silver.

On bands 1 and 2, the colors represent the following:

Color Value
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9

The 3rd band represents the multiplier.

Color Value
Black 1
Brown 1 x 101
Red 1 x 102
Orange 1 x 103
Yellow 1 x 104
Green 1 x 105
Blue 1 x 106
Violet 1 x 107
Gold 1 x 10-1
Silver 1 x 10-2

The final band relates to the tolerance.

Color Value
Blank +/- 20%
Silver +/- 10%
Gold +/- 5%

So, the example above would be the following values:

5 , 7 , 1 x 102 , +-/10%

That would be 57 x 1010Ω with a tolerable variance of +/- 10%.

10% of 57 x 1010Ω is 57Ω. So to calculate the total range, we would do the following:

57 x 1010Ω + 57Ω = Upper Range

57 x 1010Ω – 57Ω = Lower Range

So, the resistor in the example would have a total operating range of:

627Ω to 513Ω

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