Electromagnetic induction can create a voltage by movement of a conductor in a magnetic field. This voltage can make current flow, and the effect is used in electricity generation and microphones.

This video is about the invention of the electricity generator. Electromagnetic induction can create a potential difference. This potential difference causes a current, and the effect is used in ...

The film discusses the historical development and principles of electrodynamics, starting with Luigi Galvani's chance discovery of electric current through the twitching of a frog's leg.