Editing Electricity (section)

===Electromagnetic wave===
{{main|Electromagnetic wave}}
Faraday's and Ampère's work showed that a time-varying magnetic field created an electric field, and a time-varying electric field created a magnetic field. Thus, when either field is changing in time, a field of the other is always induced.<ref name=uniphysics/>{{rp|696–700}} These variations are an [[electromagnetic wave]]. Electromagnetic waves were analysed theoretically by [[James Clerk Maxwell]] in 1864. Maxwell developed a set of equations that could unambiguously describe the interrelationship between electric field, magnetic field, electric charge, and electric current. He could moreover prove that in a vacuum such a wave would travel at the [[speed of light]], and thus light itself was a form of electromagnetic radiation. [[Maxwell's equations]], which unify light, fields, and charge are one of the great milestones of theoretical physics.<ref name=uniphysics/>{{rp|696–700}}

The work of many researchers enabled the use of electronics to convert signals into [[radio frequency|high frequency]] oscillating currents and, via suitably shaped conductors, electricity permits the transmission and reception of these signals via radio waves over very long distances.<ref>{{cite book |url=https://books.google.com/books?id=XCaOycMZ6_0C |page=17 |title=Wireless Telegraphy |author=[[Charles LeGeyt Fortescue]] |year=1913 |publisher=[[Cambridge University Press]]|isbn=9781107605909 }}</ref>