Printing the resistances on the resistors would cost more than making
the resistors themselves. The industry has adopted a color scheme
for labeling resistors.
The colorcode consists of three colors, each color corresponds to a
decimal digit, and a tolerance (gold, silver). The digits are coded
according to the following table:
Think of your own mnemonic for this code. Notice the colors of the rainbow.
To read a resistorís value, begin on the end of the resistor opposite the tolerance. The colors then read 1st digit, 2nd digit, decimal power, tolerance.
For example, red, green, orange, gold is 2 5 x 10orange = 25 x 103 = 25,000 Ohm = 25 KW. ± 5%. (Gold represents 5%, silver represents 10%)
The colors to represent a 150 Ohm resistor, 10% tolerance, are brown, green, brown (15 x 101) silver.
Remember, there is no decimal point, and the third color is a power
of 10 (a logarithm)
a) 100 Ohm b)1 M Ohm
b) c) 10 k Ohm d) 500 Ohm
Give the resistance values for the following:
a) Brown, Black, Yellow
b) Red, Red, Red
c) Orange, Orange, brown
d) Brown, Green, Black