How to find a fault

Two identical channels, one battery, and only one lamp lit. Everything you have built so far has worked; this one does not, and the point is the method rather than the answer. Predict, check the supply, split the chain in half, and measure ACROSS things rather than at them.

A free lesson from Ohmwork, played entirely in your browser on a real circuit solver — about 30 minutes.

Play this lesson in your browser — no download, no sign-up, and nothing you build is sent anywhere.

The full Ohmwork workshop — in development for Mac and Windows — carries 64 lessons across five courses, six simulated Arduino boards running real compiled sketches, an oscilloscope, and fault-finding practice.