Magnetism and magnetic fields

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

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.

James Stewart explains how potential difference works in a transformer.

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