Now look at the 2nd colour band and match
that colour to the same chart. Write this number next to the 1st Digit.
The Last colour band is the number you
will multiply the result by. Match the 3rd colour band with the chart
under multiplier. This is the number you will multiple the other 2 numbers
by. Write it next to the other 2 numbers with a multiplication sign before
it. Example : 2 2 x 1,000.
To pull it all together now, simply
multiply the first 2 numbers (1st number in the tens column and 2nd in the
ones column) by the Multiplier.
Resistors are never the exact value that
the colour codes indicate. Therefore manufacturers place a tolerance
colour band on the resistor to tell you just how accurate this resistor is
made. It is simply a measurement of the imperfections. Gold means the
resistor is within 5% of being dead-on accurate. Silver being within 10%
and no colour band being within 20%. To determine the exact range that the
resistor may be, take the value of the resistor and multiply it by 5,10,
0r 20%. That is the number that the resistor may go either way.
Example: A 1,000 Ohm resistor with a gold
band maybe any value between 950 to 1050 Ohms.
Example: A 22,000 Ohm resistor with a
silver band maybe any value between 19,800 and 24,200 Ohms.
Just a few common questions to help you
1) Which side of the resistor do I read
The Gold or Silver band is always set to
the right, then you read from left to right. Sometimes there will be no
tolerance band -- Simply find the side that has a band closest to a lead
and make that the first band.
2) Sometimes the colours are hard to make
out. How do I make certain what the value of the resistor really is?
Occasionally the colours are jumbled or
burnt off. The only way to read it then is with a multimeter across the
3) How do I remember this sequence of
Remember the colour codes with this
sentence: Big Brown