John Hopkinson

John Hopkinson, FRS, (27 July 1849 – 27 August 1898) was a British physicist, electrical engineer, Fellow of the Royal Society and President of the IEE (now the IET) twice in 1890 and 1896. He invented the three-wire (three-phase) system for the distribution of electrical power, for which he was granted a patent in 1882. He also worked in many areas of electromagnetism and electrostatics, and in 1890 was appointed professor of electrical engineering at King's College London, where he was also director of the Siemens Laboratory.

For the priest (his nephew), see John Hopkinson (priest).

John Hopkinson
Born(1849-07-27)27 July 1849
Manchester, England
Died27 August 1898(1898-08-27) (aged 49)
Val d'Herens, Switzerland
NationalityBritish
Known forHopkinson effect
Hopkinson's law
Hopkinson's test
Three-phase electric power
AwardsRoyal Medal (1890)
Scientific career
Fieldsphysics, electrical engineering

Hopkinson's law, the magnetic counterpart to Ohm's law, is named after him.

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