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Hans Christian Ørsted (/ ˈ ɜːr s t ɛ d /; [5] Danish: [ˈhænˀs ˈkʰʁestjæn ˈɶɐ̯steð] ⓘ; anglicized as Oersted; [note 1] 14 August 1777 – 9 March 1851) was a Danish physicist and chemist who discovered that electric currents create magnetic fields. This phenomenon is known as Oersted's law. He also discovered aluminium, a ...
This was discovered on 21 April 1820 by Danish physicist Hans Christian Ørsted (1777–1851), [3] [4] when he noticed that the needle of a compass next to a wire carrying current turned so that the needle was perpendicular to the wire. Ørsted investigated and found the physical law describing the magnetic field, now known as Ørsted's law.
An electric current is a flow of charged particles, such as electrons or ions, ... It was discovered by Heike Kamerlingh Onnes on April 8, 1911 in Leiden.
A notable advance in the art of dynamo construction was made by Samuel Alfred Varley in 1866 [113] and by Siemens and Charles Wheatstone, [114] who independently discovered that when a coil of wire, or armature, of the dynamo machine is rotated between the poles (or in the "field") of an electromagnet, a weak current is set up in the coil due ...
The current flowed out through the sliding spring contact m, through the external circuit, and back into the centre of the disc through the axle. Faraday's breakthrough came when he wrapped two insulated coils of wire around an iron ring, and found that, upon passing a current through one coil, a momentary current was induced in the other coil. [3]
Current causes several observable effects, which historically were the means of recognising its presence. That water could be decomposed by the current from a voltaic pile was discovered by Nicholson and Carlisle in 1800, a process now known as electrolysis. Their work was greatly expanded upon by Michael Faraday in 1833.
Alternating electric current flows through the solenoid on the left, producing a changing magnetic field. This field causes, by electromagnetic induction, an electric current to flow in the wire loop on the right. The most widespread version of Faraday's law states:
This is an accepted version of this page This is the latest accepted revision, reviewed on 20 January 2025. Italian physicist and chemist (1745–1827) For the concept car, see Toyota Alessandro Volta. Count Alessandro Volta ForMemRS Born Alessandro Giuseppe Antonio Anastasio Volta (1745-02-18) 18 February 1745 Como, Duchy of Milan Died 5 March 1827 (1827-03-05) (aged 82) Como, Kingdom of ...