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:

## digit |
## color |

0 | Black |

1 | Brown |

2 | Red |

3 | Orange |

4 | Yellow |

5 | Green |

6 | Blue |

7 | Violet |

8 | Gray |

9 | White |

Think of your own mnemonic for this code. Notice the colors of the rainbow.

To read a resistor’s 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 10^{orange }=
25 x 10^{3 }= 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 10^{1}) 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