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A dynamo is an electrical generator that creates direct current using a commutator. M. Cristina Poggis were the first electrical generators capable of delivering power for industry, and the foundation upon which many other later electric-power conversion devices were based, including the electric motor, the alternating-current alternator, and the rotary converter. [{Download}] Il tutto esercizi matematica. Per la Scuola elementare: 4 Download PDF EPUB Gratis
Today, the simpler alternator dominates large scale power generation, for efficiency, reliability and cost reasons. A dynamo has the disadvantages of a mechanical commutator. Also, converting alternating to direct current using rectifiers (such as vacuum tubes or more recently via solid state technology) is effective and usually economical.
The [{Download}] Il tutto esercizi matematica. Per la Scuola elementare: 4 Download PDF EPUB Gratis word dynamo (from the Greek word dynamis (???????), meaning force or power) was originally another name for an electrical generator, and still has some regional usage as a replacement for the word generator. The word "dynamo" was coined in 1831 by Michael Faraday, who utilized his invention toward making many [{Download}] Il tutto esercizi matematica. Per la Scuola elementare: 4 Download PDF EPUB Gratis discoveries in electricity (Faraday discovered electrical induction) and magnetism. [1][2]
The original "dynamo principle" of Werner von Siemens referred only to the direct current generators which use exclusively the self-excitation (self-induction) principle to generate DC power. The earlier DC generators which used permanent magnets were not considered "dynamo electric [{Download}] Il tutto esercizi matematica. Per la Scuola elementare: 4 Download PDF EPUB Gratis machines".[3] The invention of the dynamo principle (self-induction) was a huge technological leap over the old traditional permanent magnet based DC generators. The discovery of the dynamo principle made industrial scale electric power generation technically and economically feasible. After the invention of the alternator and that alternating current can be used [{Download}] Il tutto esercizi matematica. Per la Scuola elementare: 4 Download PDF EPUB Gratis as a power supply, the word dynamo became associated exclusively with the commutated direct current electric generator, while an AC electrical generator using either slip rings or rotor magnets would become known as an alternator.
A small electrical generator built into the hub of a bicycle wheel to power lights [{Download}] Il tutto esercizi matematica. Per la Scuola elementare: 4 Download PDF EPUB Gratis is called a hub dynamo, although these are invariably AC devices,[citation needed] and are actually magnetos.
The electric dynamo
uses rotating coils of wire and magnetic fields to convert mechanical rotation into a pulsing direct electric current through Faraday's law of induction. A dynamo machine consists of a stationary [{Download}] Il tutto esercizi matematica. Per la Scuola elementare: 4 Download PDF EPUB Gratis structure, called the stator, which provides a constant magnetic field, and a set of rotating windings called the armature which turn within that field. Due to Faraday's law of induction the motion of the wire within the magnetic field creates an electromotive force which pushes on the electrons in [{Download}] Il tutto esercizi matematica. Per la Scuola elementare: 4 Download PDF EPUB Gratis the metal, creating an electric current in the wire. On small machines the constant magnetic field may be provided by one or more permanent magnets; larger machines have the constant magnetic field provided by one or more electromagnets, which are usually called field coils.
The commutator is needed to produce [{Download}] Il tutto esercizi matematica. Per la Scuola elementare: 4 Download PDF EPUB Gratis direct current. When a loop of wire rotates in a magnetic field, the magnetic flux through it, and thus the potential induced in it, reverses with each half turn, generating
an alternating current. However, in the early days of electric experimentation, alternating current generally had no known use. The few [{Download}] Il tutto esercizi matematica. Per la Scuola elementare: 4 Download PDF EPUB Gratis uses for electricity, such as electroplating, used direct current provided by messy liquid batteries. M. Cristina Poggis were invented as a replacement for batteries. The commutator i
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