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Joseph Henry (December 17, 1797 [1] [2] – May 13, 1878) was an American physicist and inventor who served as the first secretary of the Smithsonian Institution.He was the secretary for the National Institute for the Promotion of Science, a precursor of the Smithsonian Institution. [3]
Electromagnetic induction was discovered by Michael Faraday, published in 1831. [3] [4] It was discovered independently by Joseph Henry in 1832. [5] [6] In Faraday's first experimental demonstration (August 29, 1831), he wrapped two wires around opposite sides of an iron ring or "torus" (an arrangement similar to a modern toroidal transformer).
Electromagnetic induction was discovered independently by Michael Faraday in 1831 and Joseph Henry in 1832. [4] Faraday was the first to publish the results of his experiments. [5] [6] Faraday's 1831 demonstration [7]
Joseph Henry. The discovery of electromagnetic induction was made almost simultaneously, although independently, by Michael Faraday, who was first to make the discovery in 1831, and Joseph Henry in 1832. [77] [78] Henry's discovery of self-induction and his work on spiral conductors using a copper coil were made public in 1835, just before ...
The henry (symbol: H) is the unit of electrical inductance in the International System of Units (SI). [1] If a current of 1 ampere flowing through a coil produces flux linkage of 1 weber turn, that coil has a self-inductance of 1 henry. The unit is named after Joseph Henry (1797–1878), the American scientist who discovered electromagnetic induction independently of and at about the same ...
The history of electromagnetic induction, a facet of electromagnetism, ... The unit of inductance in the SI system is the henry (H), named after Joseph Henry, ...
1834 – Heinrich Lenz determines the direction of the induced electromotive force (emf) and current resulting from electromagnetic induction. Lenz's law provides a physical interpretation of the choice of sign in Faraday's law of induction (1831), indicating that the induced emf and the change in flux have opposite signs.
English physicist Michael Faraday published the law of induction (Joseph Henry developed the same law independently). 1831: American scientist Joseph Henry in the United States developed a prototype DC motor. 1832: French instrument maker Hippolyte Pixii in France developed a prototype DC generator. 1833: Michael Faraday developed the laws of ...