A little question about Javascript Resistance Caculator

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    Javascript Resistance
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Discussion Overview

The discussion revolves around understanding the concept of tolerance in resistor color coding, specifically in the context of a Javascript Resistance Calculator. Participants explore the definitions and implications of tolerance in relation to resistor values, as well as practical challenges in reading color codes accurately.

Discussion Character

  • Conceptual clarification
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks clarification on the term "tolerance" as used in resistor specifications.
  • Another participant explains that tolerance refers to the range of acceptable values around a resistor's nominal value, providing examples of how this affects actual resistance values.
  • A participant shares links to external resources about E series and resistor color codes, suggesting further reading.
  • Another participant notes the importance of accurately reading color bands, mentioning that colors can appear differently under various lighting conditions, which can complicate the decoding process.
  • A later reply emphasizes the challenges of distinguishing similar colors under certain lighting conditions, suggesting the use of specific types of light for better accuracy.

Areas of Agreement / Disagreement

Participants generally agree on the definition of tolerance and its significance in resistor values. However, there are differing views on the practical challenges of accurately reading resistor color codes, particularly regarding lighting conditions and color perception.

Contextual Notes

Limitations include potential misunderstandings of color perception under different lighting and the assumption that all participants have access to the same resources for decoding color codes.

Who May Find This Useful

This discussion may be useful for individuals interested in electronics, particularly those learning about resistor specifications and color coding, as well as those developing tools related to electronics calculations.

KENNEL STW
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Javascript Resistance Calculator

The values of the resistor are calculated from the colour of the bands. The values of the colours are shown in Table 1. The first band is the tens values. The second band gives the units, the third band is a multiplying factor the factor being 10band value. The fourth band gives the tolerance of the resistor. No band implies a tolerance of ± 20%, a silver band means the resistor has a tolerance of ± 10% and a gold band has the closest tolerance of ± 5%.

This is what I read in suplung,and I am not a native English speaker,so can you expain the word tolerance there to me? Thank you so much!Have a good day because there going to have a game of liverpool today hhhhh
 
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"tolerance" is the accuracy of a resistor's nominal value to its actual value.

A resistor that says "100Ω" with 20% tolerance could have a real value between 80-120Ω. If it is marked as 5% tolerance its real value should be between 95 and 105Ω.
 
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Welcome to PF.
KENNEL STW said:
The values of the resistor are calculated from the colour of the bands. The values of the colours are shown in Table 1.
Can your use the "Attach files" link below the Edit window to upload Table1? Thanks.

Also, keep in mind that if you are trying to decode resistor color codes, you will need to be able to handle the color bands in either order. That's something that EEs deal with in real life all the time. Oh, and sometimes "red" is washed out to look more like "brown", and "gold" tolerance can look like "brown" too. So reading the color code can involve some AI (and/or guesswork and a DVM to back up the guesswork). :smile:
 
berkeman said:
Oh, and sometimes "red" is washed out to look more like "brown", and "gold" tolerance can look like "brown" too.
I have a compact fluorescent work-light with an emission spectrum that makes red and orange look the same to human eyes; 33k = 22k = 3k3.

Use daylight or a bright filament lamp to read component color codes.
 

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