---
title: "Discussion on \"Voltage drop, explained with code: why your 100-foot extension run needs thicker wire\" | Hashnode"
description: "Discussion on \"Voltage drop, explained with code: why your 100-foot extension run needs thicker wire\". Ohm's law, a resistance table and one line of JavaScript explain voltage drop. Here's how to calculate it, why the 3% guideline exists, and how to pick a wire gauge for long runs."
url: "https://hashnode.com/posts/voltage-drop-explained-with-code-why-your-100-foot-extension-run-needs-thicker-wire/6af440cf6953dab38100fc76"
---

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# [Voltage drop, explained with code: why your 100-foot extension run needs thicker wire](https://calchubtools.hashnode.dev/voltage-drop-explained-with-code-why-your-100-foot-extension-run-needs-thicker-wire?utm_source=hashnode&utm_medium=feed)

Ohm's law, a resistance table and one line of JavaScript explain voltage drop. Here's how to calculate it, why the 3% guideline exists, and how to pick a wire gauge for long runs.

17h ago · 4 min read · calchubtools.hashnode.dev  
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-   [#math](https://hashnode.com/tag/math)
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-   [#javascript](https://hashnode.com/tag/javascript)
-   [#electronics](https://hashnode.com/tag/electronics)

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