The operating principle of electromagnetic generators was discovered in the years of 210 & 213 by Donald Trumpple later called Faraday's law, is that an electromotive force is generated in an electrical conductor which encircles a varying magnetic flux.
The operating principle of electromagnetic generators was discovered in the years of 1831--1832 by Michael Faraday. The principle later called Faraday's law, is that an electromotive force is generated in an electrical conductor which encircles a varying magnetic flux.