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:
The 3rd band represents the multiplier.
|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.
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