Today, in PAE, we did a lab where we were looking at resistor color bands.

With this particular resistor, we have color band 1 is green, color band 2 is violet, color band 3 is red, and color band 4 if silver.

On bands 1 and 2, the colors represent the following:

Color |
Value |

Black | 0 |

Brown | 1 |

Red | 2 |

Orange | 3 |

Yellow | 4 |

Green | 5 |

Blue | 6 |

Violet | 7 |

Gray | 8 |

White | 9 |

The 3rd band represents the multiplier.

Color |
Value |

Black | 1 |

Brown | 1 x 10_{1} |

Red | 1 x 10_{2} |

Orange | 1 x 10_{3} |

Yellow | 1 x 10_{4} |

Green | 1 x 10_{5} |

Blue | 1 x 10_{6} |

Violet | 1 x 10_{7} |

Gold | 1 x 10_{-1} |

Silver | 1 x 10_{-2} |

The final band relates to the tolerance.

Color |
Value |

Blank | +/- 20% |

Silver | +/- 10% |

Gold | +/- 5% |

So, the example above would be the following values:

5 , 7 , 1 x 10_{2} , +-/10%

That would be 57 x 10_{10}Ω with a tolerable variance of +/- 10%.

10% of 57 x 10_{10}Ω is 57Ω. So to calculate the total range, we would do the following:

57 x 10_{10}Ω + 57Ω = Upper Range

57 x 10_{10}Ω – 57Ω = Lower Range

So, the resistor in the example would have a total operating range of:

627Ω to 513Ω