Electric World Simple Electricity And Magnetism 1


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Electric World Simple Electricity And Magnetism 1 - A coil of wire rotating in a magnetic field produces a current which changes direction with each 180° rotation, an alternating current (AC). However many early uses of electricity required direct current (DC). In the first practical electric generators, called dynamos, the AC was converted into DC with a commutator, a set of rotating switch contacts on the armature shaft.. An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.The magnetic field disappears when the current is turned off. Electromagnets usually consist of wire wound into a coil.A current through the wire creates a magnetic field which is concentrated in the hole in the center of the coil..

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