Skip to content

README.md

Latest commit

 

History

History
106 lines (61 loc) · 3.17 KB

README.md

File metadata and controls

106 lines (61 loc) · 3.17 KB

Resistor Color Code Calculator

Resistor Color Code Calculator is a useful, interactive and modern web application (built with HTML, CSS and JavaScript) that calculates the resistance value of 3, 4, 5, and 6-band resistors.

Try the Resistor Color Code Calculator!

Interface Preview

A 3-band resistor example showing Brown (1), Black (0), Red (x100Ω) bands resulting in a resistance of 1 KΩ (1000 Ω)].

Resistor Color Code Calculator Interface Preview

Features

  • Supports 3, 4, 5, and 6-band resistors.
  • Live SVG preview that updates based on user's choices.
  • Input validation with error messages.
  • Color-coded dropdown borders for visual feedback.
  • Automatic unit conversion (Ω → KΩ → MΩ) based on resistance.

User Guide

  1. Select the number of bands.
  2. Choose the color for each band from the dropdown menus.
  3. Click Calculate to display the resistance value.

Mathematical Logic

The resistance value is calculated based on the number of bands:

3-Band Resistor:

$$R = (digit_1 \times 10 + digit_2) \times multiplier$$

4-Band Resistor:

$$R = (digit_1 \times 10 + digit_2) \times multiplier \pm tolerance$$

5-Band:

$$R = (digit_1 \times 100 + digit_2 \times 10 + digit_3) \times multiplier \pm tolerance$$

6-Band:

$$R = (digit_1 \times 100 + digit_2 \times 10 + digit_3) \times multiplier \pm tolerance$$ $$\text{+ Temperature Coefficient (ppm/K)}$$

Glossary of Terms

  • Resistance: The measure of the opposition to the flow of electric current within a circuit, measured in Ohms (Ω).
  • Band: A colored ring painted on the body of a resistor, representing a specific numerical value, multiplier, or tolerance.
  • Significant Digit: The primary numbers derived from the first two (or three) bands, which form the base value of the resistor.
  • Multiplier: The factor by which the significant digits are multiplied to determine the total resistance in Ohms ($\Omega$).
  • Tolerance: The acceptable percentage by which the actual resistance is allowed to deviate from its stated nominal value.
  • Temperature Coefficient: The rate at which the resistance value changes in response to temperature variations, typically measured in ppm/K.
  • ppm/K: Parts per million per Kelvin. A unit denoting how many millionths of an Ohm the resistance will change for each degree Kelvin (or Celsius) change in temperature.

Built With

  • HTML
  • CSS
  • JavaScript

Project Structure

  • index.html: The main structure, UI layout, and SVG layout.
  • style.css: Styling, transitions, and responsive design.
  • script.js: Core logic for calculations, UI toggling, and validation.

Acknowledgements

License

MIT License: Free to use, modify, and distribute with attribution.

Developer

Dimitrios Poulos
Electrical & Computer Engineering Student

  • Release Date: March 2026