Free Technical Repair Tip Identifying Resistors:
Carbon and FlameProof resistors are marked with COLOR CODES.
The first two color bands are the first two digits;
the third color band is the "multiplier" (number of "zeros")
Ancient "3-band" Carbon Resistors (no fourth color band) are 20% tolerance.
"3-band" Example: Green (5), Black (0), Silver (X.01) = .5 ohm 20% tolerance
"3-band" Example: Yellow (4), Violet (7), Gold (X.1) = 4.7 ohm 20% tolerance
"3-band" Example: Brown (1), Black (0), Red (add 2 "Zeros") = 1000 ohm 20% tolerance

Most recent (1980 & newer) resistors have 4 color bands.
The first two color bands are the first two digits;
the third color band is the "multiplier" (number of "zeros")
and the fourth color band is the tolerance.
"4-band" Example: Green (5), Black (0), Silver (X.01), Silver=10% tolerance, =.5 ohm
"4-band" Example: Blue (6), Gray (8), Brown (add 1 "zero"), Gold=5% tolerance =680 ohm
"4-band" Example: Gray (8), Red (2), Red (add 2 "Zeros"), Red=2% tolerance =8200 ohm

5-band (1% precision) resistors
The first three color bands are the first three digits;
the fourth color band is the "multiplier" (number of "zeros")
fifth color band (brown =1%) is the tolerance for all examples in this paragraph
"5-band" example: brown=1, green=5, yellow=4, brown="1 zero" brown=1% =1540 ohms =1.54K
"5-band" example: green=5, brown=1, brown=1, brown="1 zero" brown=1% =5110 ohms =5.11K
"5-band" example: green=5, blue=6, red=2, brown="1 zero" brown=1% =5620 ohms =5.62K
"5-band" example: yellow=4, yellow=4, red=2, red="2 zeros" brown=1% =44200 ohms =44.2K
"5-band" example: blue=6, brown=1, white=9, red="2 zeros" brown=1% =61900 ohms =61.9K
"5-band" example: red=2, red=2, brown=1, orange="3 zeros" brown=1% =221000 ohms =221K

Black = 0
Brown = 1 (also used for 1% tolerance)
Red = 2 (also used for 2% tolerance)
Orange = 3
Yellow = 4
Green = 5
Blue = 6
Violet = 7
Gray = 8
White =9
Gold (as multiplier = 1/10; as tolerance = 5%)
Silver (as mulitplier = 1/100; as tolerance =10%)