The resistor above has four colors. Green, blue, red, gold.
My calculation says its value is 562 ohms +-10%. But this page says its value is 5.6K-1/4W. What is my mistake?
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The third band (adjacent to the tolerance band) is a multiplier. This means that it is the number of zeroes after the first two digits. For example, a brown-red-orange-gold resistor would be 1 2 000 (three zeroes, since orange stands for 3) ohms.
For the record, a gold band means 5%, not 10%.
Well, in this 4 band resistor, the 4th band is actually % rating, as you guessed. However depending on how you google for tables, you have to search for "3 band resistor table" (yes, its confusing.. maybe the 4th band was an addendum/optional?).
So the first two bands represent algarisms, and the third represents an "n" multiplier (10ˆn).
So the value is given by:
[("band 1" *10) + (band 2)] * 10ˆ(band 3).
[50 + 6] * 100 = 5600, aka 5.6k, aka 5k6.
Or more roughly put:
Band 1 = algarism 1
Band 2 = algarism 2
Band 3 = amount of zeroes
In a resistor with 5 color bands (the 5th being %), the same applies, but the first 3 bands are algarisms and the 4th is the multiplier.