Raspberry Pi A User Manual page 223

C H A P T E R 1 3
To read the example resistor, first take the two resistance bands starting from the left: these
are coloured red and red. Red, on the table included in Figure 13-1, equates to the value 2, so
the initial reading is 22. The next band is green, which is the multiplier and equates to 10
100,000 (10 followed by five zeros). Multiplying 22 by 100,000 equals 2,200,000, which is
the resistance value in ohms: 2,200,000 Ω.
There are 1,000 ohms in a kiloohm, and 1,000 kiloohms in a megaohm. Thus, 2,200,000 Ω
would typically be written as 2,2 MΩ. The final 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 13-1.
L E A R N I N G T O H A C K H A R D W A R E
207
Figure 13-1:
A four-band
resistor and the
decoding table
for its colour
code
5
or