Free interactive modules

Watch it. Build it. Find the fault.

Short, clear explainers on how vehicles work, for apprentices and new technicians. Each module goes with a set of Bay One videos and lets you build the circuit, break it and work out what went wrong.

Start Module 1 Watch the videos

How a module works

  1. Watch the episode

    Every section links to the Bay One video that covers it, so you can see it explained first.

  2. Try it on the bench

    Move the sliders, add lamps, snap a filament or corrode an earth, and watch the current respond.

  3. Check what you know

    Work through real symptoms on the fault bench, then pass the knowledge check at 75%.

Modules

Each one takes about 25 minutes. Start with Module 1: the others build on it.

Module 1Ready

Circuits and Ohm's law

Voltage, current and resistance, then series, parallel and mixed circuits, and why one bad earth dims everything on it.

8 sectionsEpisodes 05, 09, 10, 11
Start
Module 2Ready

Volt drop

Where the voltage goes, why an unplugged test misses a bad joint, and where to put the probes to find it.

8 sectionsEpisode 06
Start
Module 3Ready

The starter motor system

Key to relay to solenoid to pinion: follow the current through a full crank, then diagnose "clicks but won't crank".

8 sectionsEpisodes 02, 03, 07, 08
Start