Magnetism and electromagnetism

James Stewart explains how potential difference works in a transformer.

Dr George Dransfield explains how to detect and then draw magnetic fields.

Dr George Dransfield explains how an AC generator works and what its output looks like on a graph.

Dr George Dransfield explains how a DC generator works and what its output looks like on a graph.

This video explains how electromagnetism is due to the magnetic fields around electric currents.