Page Structure
The tool is organized as one maintained classroom page with four major content blocks: an Ohm's Law explainer, the missing-value calculator, the series/parallel calculator, and the resistor color decoder.
<header>title + cross-links</header> <main> <section>Ohm's Law summary</section> <section>interactive calculator</section> <section>series and parallel helper</section> <section>color code decoder</section> </main>
Calculator Logic
The tool reads the voltage, current, and resistance fields. If exactly two are filled, it computes the third using the standard Ohm's Law relationship. If fewer or more than two are filled, it shows a friendly instruction instead of guessing.
if (missingKey === "V") computed = I * R; else if (missingKey === "I") computed = V / R; else computed = V / I;
Resistance Totals
The series/parallel section parses a comma-separated input into numeric resistor values, sums them for the series total, and uses reciprocal addition for the parallel total.
Color Decoder
The band dropdowns are populated from standard resistor tables. When the user clicks decode, the script combines the first two digits, applies the multiplier, and adds tolerance text if selected.
How This Connects To The Site
This tool lives under /tools/ because it is a reusable classroom utility, while the conceptual teaching content lives in Electronics Fundamentals.