Ohm's Law Interactive - IGCSE 0625/0972

A complete Ohm’s Law lesson built around an interactive simulator your students actually drive. It runs offline in any browser - no install, no login.
Written for Cambridge IGCSE Physics 0625 / 0972 (4.2.4 Resistance) and equally at home in AQA, Edexcel and OCR GCSE lessons. Ages 14-16.

Please read: this is an HTML file, not a PowerPoint

The simulator is a single .html file. You double-click it and it opens in your web browser, exactly like a web page - except that nothing is downloaded and no internet connection is needed. There is no PowerPoint version. If you specifically need editable slides, this is not the resource for you, and I would rather say so here than have you find out after buying.
The worksheet is supplied as an editable Word file as well as a PDF, so you can cut or reword any of it.

What’s included

• Ohms-Law-Interactive-Simulator.html - the simulator
• Student worksheet - PDF and editable Word, a two-part investigation plus exam-style questions (12 marks)
• Answer key - PDF, with mark allocations, marking notes and the mistakes students actually make
• Teacher notes - PDF, a 10-minute front-of-class route and a 35-minute student route
• A short read-me explaining how to open everything

How it opens

• Windows, Mac and Chromebook laptops - double-click and it opens in the default browser. Chrome, Edge, Safari and Firefox all work.
• If your computer opens it in a text editor instead, right-click the file, choose “Open with”, and pick your browser.
• Your browser may ask you to confirm the download once, because .html is an uncommon thing to download. That is expected.
• Tablets - this is built for computers and interactive whiteboards. Opening a local HTML file on an iPad is awkward, so I would not recommend it for a tablet-only classroom.

What makes it different

Most Ohm’s Law resources are slides that animate at you. In this one the students set the voltage and the resistance themselves, the current updates as they drag, and the current-voltage graph draws itself alongside - so the straight line through the origin stops being something they memorise and becomes something they watched happen.
A 3D model runs next to the numbers. The battery visibly lifts the charge through a height equal to the voltage, and the resistor is a saw-tooth the charges have to fight their way down. Raise the resistance and it grows more teeth. One toggle switches between conventional current and electron flow, and the direction reverses on screen - the fastest way I have found to fix that particular confusion.
There is a Full screen button for the whiteboard.