Value (the first two bands on a four-band resistor, the first three on one with five bands)
Black = 0
Brown = 1
Red =2
Orange = 3
Yellow = 4
Green = 5
Blue = 6
Purple = 7
Grey = 8
White = 9
Multiplier (the third band on a four-band resistor, the forth band on a five-band resistor)
Black = x 10^0 (=1)
Brown = x 10^1 (=10)
Red = x 10^2 (=100)
Orange = x 10^3 (=1,000)
Yellow = x 10^4 (=10,000)
Green = x 10^5 (=100,000)
Blue = x 10^6 (=1,000,000) (rarely used)
Gold = x 0,1
Silver = x 0,01
Tolerance (the forth band on a four-band resistor, the fifth band on a five-band resistor)
Brown = 1%
Gold = 5%
Silver = 10%
Example 1:
Take a resistor with four bands, Red-Red-Orange-Gold:
Red = 2
Red = 2
Orange = x 1,000
Gold = 5%
The resistor is 22,000 ohms or 22k with a +/- 5% tolerance on the value.
Example 2:
Take a resistor with five bands, Red-Red-Orange-Brown-Brown:
Red = 2
Red = 2
Orange = 3
Brown = x 10
Brown = 1%
The resistor is 2230 ohms or 2k23 with a +/- 1% tolerance on the value.
Hope this helps!
/U.
