Physics

Pick a topic to start. Each one builds up from first principles with live diagrams you can drag and break.

Charge, current, voltage, resistance, series and parallel circuits — six lessons, a live lab, and practice questions.

Label the plug, what each wire does, why the fuse sits in the live line, and choosing a fuse rating. Nine questions.

Rays and ray diagrams, reflection and mirrors, refraction and dispersion, and the impact of radiation.