The ohmage of a resistor is encoded in four, or sometimes three, bands of color
that encircle the resistor.

The first two bands of the resistor encode
the first two digits of the ohmage rating.
The meaning of the colors are:
	0	Black
	1	Brown
	2	Red
	3	Orange
	4	Yellow
	5	Green
	6	Blue
	7	Violet
	8	Gray
	9	White

The third color band is a multiplier.  Use the above chart to
translate the color to a number, n.  The multiplier is 10^^n,
that is 10 to the n'th power.  Multiple the two digit number
obtain from the first two bands by this power of 10.

If a fourth band is present, it encodes a "slop" factor
expressed as a precentage.  The meaning of these colors are:
	5%	gold
	10%	silver
	20%	no band

Now, let's try an example.  Suppose the four bands are
	yellow		4
	violet		7
	green		5
	silver		10%
then the ohmage of the resistor is within 10% of 47*10^^5, or 4700000, ohms.


Thanks for Mike Wilson for a tutorial on the meaning of resistors.