The Discovery of Electricity:
Schematic diagram of a copper–zinc voltaic pile. 
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Democritus
(460

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Charles

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Luigi Galvani (1737–1798) discovers that two unlike metals immersed
in

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Alessandro Volta (1745–1827)
discovers that a current ﬂows between
two connected unlike metals in a salt solution and, thus, invents the
battery.

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André Ampere (1775–1836) develops the
theory of magnetic lines of force and quantiﬁes electric current for the ﬁrst time.

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Hans Christian Ørsted (1777–1851) discovers a connection between electric
current and magnetism and a way to measure electric current by the deﬂection of a magnet.

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Georg Ohm (1787–1854) discovers the
relationship (Ohm’s Law) between voltage, current, and resistance in a
circuit.

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Michael Faraday (1791–1867) analyzes the chemical reactions in

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James Clerk Maxwell (1831–1879)
develops the mathematical equations relating electricity and
magnetism.

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Joseph Thomson (1856–1940) proves that electricity consists of
electrons.

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