Hardware Reference
In-Depth Information
Figure 12-1:
A four-band
resistor and the
decoding table
for its colour
code
To read the example resistor, irst take the two resistance bands starting from the left: these
are coloured red and red. Red, on the table included in Figure 12-1, equates to the value 2, so
the initial reading is 22. he next band is green, which is the multiplier and equates to 105 or
100,000 (10 followed by ive zeros). Multiplying 22 by 100,000 equals 2,200,000, which is
the resistance value in ohms: 2,200,000 Ω.
here are 1,000 ohms in a
kiloohm
, and 1,000 kiloohms in a
megaohm.
hus, 2,200,000 Ω
would typically be written as 2,2 MΩ. he inal band, located on the right side of the resistor,
is gold and details the tolerance, or accuracy, of the resistor, which is plus or minus 5 percent
in the example shown in Figure 12-1.
