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To determine the value of a resistor from the color band markings, hold the
resistor so that the gold or silver band is to the right. If there are only
3 bands, hold the resistor so that the 3 colors are closest to the left end.
Next, click on one color in each of the 4 colums to the right so that the
resistor image above agrees with the resistor markings. The first two colors
represent two digits, each from 0-9. The third color represents the number of
zeros to add, and the fourth or right side color represents the tollerance. The
color values correspond to the colors of the rainbow where violet has a
higher value of (7) than red (2) since violet is closer to the higher end
of the light spectrum. Black is lowest with a value of 0 and white the highest
with a value of 9. The calculator below can be used to determine the equivalent
value of two resistors in series or parallel. Enter values for R1 and R2 and
then press the "=" button. Standard 5% values are shown in parenthesis, standard
1% values are shown in the box below. Scroll down page for a list of standard
5% values.
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