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Resistor Colour Codes

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Bye	Bye	Rosie	Off	You	Go to	Birmingham	Via	Great	Western.
0	1	2	3	4	5	6	7	8	9
Black	Brown	Red	Orange	Yellow	Green	Blue	Violet	Gray	White

This mnemonic rhyme is a good way to remember the order of the colours in the resistor colour code.
Especially for older British people who can remember the Great Western railway.
With the exception of Black, Brown, Gray and White, the colours are in the same order as the rainbow colours.

Three Stripe Resistors

The resistor value is coded as coloured stripes.
The first stripe represents a number. (Yellow = 4)
The second stripe represents a number. (Violet = 7)
The last stripe represents the number of zeros. (Orange = 000)
The optional tolerance stripe represents the accuracy. (Red = 2%)
47 000 Ohms or 47 kΩ or 47K.

Four Stripe Resistors - Not Common

The resistor value is coded as coloured stripes.
The first stripe represents a number. (Yellow = 4)
The second stripe represents a number. (Violet = 7)
The third stripe represents a number. (Black = 0)
The last stripe represents the number of zeros. (Red = 00)
The optional tolerance stripe represents the accuracy. (Red = 2%)
47 000 Ohms or 47 kΩ or 47K.

Tolerances

Accuracy of manufacture.

	Colour	Tolerance	Letter Code
Brown		1%	F
Red		2%	G
Gold		5%	J
Silver		10%	K
Unmarked		20%	M

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