Javascript Simulation: Taking Ohm’s Law to the Next Level

Thiyagu Arunachalam
3 min readFeb 6, 2025

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When it comes to simulations, competition is intense, and there’s no such thing as “enough” in the world of simulation tools.

In this article, we’ll dive into a case study of one such simulation — how it was built and what it can do.

This Ohm’s law simulation is part of my simulation collection app (though it currently contains only two simulations, many more are in cooking 😶).

While it is based on Ohm’s law, it doesn’t simply explain the formula; instead, it serves a different purpose.

What Does the Ohm’s Law Simulation Do?

For starters, this simulation helps determine voltage or current based on a given resistor value, assuming either voltage or current is known.

But it goes beyond that by providing additional useful features for handling resistors in different situations:

  1. Using standard resistor values (common resistors available on the market)
  2. Identifying the value of an unknown resistor (based on its color bands)
  3. Finding the color code for a known resistor value

These three scenarios make the simulation a handy tool for anyone working with resistors. Let’s explore them one by one.

Ohm’s Law Simulation with Standard Resistor Values

In this scenario, the simulation provides a set of selectable buttons corresponding to commonly available resistor values.

When a resistor value is selected, its color code is automatically displayed on a simulated resistor with color bands.

Additionally, the simulation offers tolerance options to match real-world resistor variations.

If either voltage or current is provided as input, the tool calculates the missing value accordingly.

Ohm’s law simulation with the standard resistors
Ohm’s law calculator with standard resistors

Ohm’s Law Simulation with a Resistor in Hand

Imagine you find a resistor but don’t know its resistance value. Looking it up in a book or through an online search can be time-consuming.

This simulation provides an interactive way to determine a resistor’s value.

Simply select the colors of the bands on the resistor one by one, and the simulation will decode its resistance.

Once the resistance is identified, you can enter the voltage or current to determine the other value, following Ohm’s law.

Ohm’s law simulation with resistors in hand
Ohm’s law calculator with know resistance value

Ohm’s Law Simulation to Find the Color Band

This feature comes in handy when you know the resistance value you need but aren’t sure about its color coding.

Simply enter the desired resistor value, and the simulation will generate an image of the corresponding resistor with the correct color bands.

This helps when you need to purchase a specific resistor or find the closest available option in the market.

Note: Not all the color band combinations make commercial resistors. Availability depends on standard market offerings.

Ohm’s law simulation with known resistor
Ohm’s law calculaors with known value

How Was This Simulation Made?

This simulation is primarily UI-driven, with all components and calculations developed using Angular and Bootstrap.

The application follows a module-based approach to enhance performance and maintainability.

This modular structure allows for efficient versioning and future scalability.

For details on specific versions and libraries used, please check out the GitHub repository.

While the project is open source, there are some restrictions on direct code contributions. But there are no restrictions on downloading or reusing it.

If you’re interested in contributing to this initiative, feel free to reach out at support@kitsunechaos.com.

Final Thoughts

This simulation provides a beginner-friendly approach to learning Ohm’s law and resistor color coding.

It’s still evolving, and I’m open to suggestions for improvements or new features.

If you’re interested, check out the simulation and share your feedback! Enthusiasts and learners, I’d love to hear your thoughts — it won’t take much time! :)

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Thiyagu Arunachalam
Thiyagu Arunachalam

Written by Thiyagu Arunachalam

Hi there! I'm a science and technology enthusiast with a passion for writing about the latest developments in science and Tech.

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