What is Faraday cage?
[[File:Heimbach - power plant 07 ies.jpg|thumb|alt=Faraday shield at Art Nouveau power plant in Heimbach, Germany|right|230px|Common type of Faraday cage: it prevents machines inside from causing radio interference outside]] [[File:Cage de Faraday.jpg|thumb|right|230px|Girl inside is protected from electric arc outside]] A '''Faraday cage''' or Faraday shield is an [[wikt:enclosure|enclosure]] made from material that [[electrical conductivity|conducts]] [[electricity]]. It is used to block [[electric field]]s. The Faraday cage is named after the English scientist [[Michael Faraday]], who invented it in 1836. An electrical field outside the cage causes electric charges in the cage's conducting material to move around and cancel the field's effect inside the cage. It protects sensitive electronic equipment from external radio frequency interference (RFI). Faraday cages are also used to enclose devices that produce RFI, such as [[radio transmitter]]s, to prevent their radio waves from interfering with other nearby equipment. They are also used to protect people and equipment against actual electric currents such as [[lightning]] strikes and [[electrostatic]] discharges. The enclosing cage conducts current round the outside of the enclosed space and none passes though the inside space. [[Category:Electricity]] {{sci-stub}}