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Papers > Technology > Faraday s Law and Transformers
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Faraday s Law and Transformers |
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... For a given current and for a given coil, Amperes law permits calculation of the magnetic flux density, B, and through integration of B, calculation of the magnetic flux, Ö. ... Faraday’s law describes the relationship between the change in the flux and the induced emf. Michael Faraday considered a complementary problem in which magnetic flux, Ö , passes through a coil that consists of N turns of wire. In that case, the voltage, v(t), that appears between the ends of the coil of wire is given by Faradays law: (2) If the flux is constant in time, note that no voltage appears across the coil. ... Both coils must obey faraday’s law, therefore we obtain the following: (3) V1, N1, and Ö1 are the emf across, the number of turns of coil, and the flux through the primary coil, respectively. ... If the flux in the two coil I s the same then: (4) Rearranging the equation yields the equation for the gain of an ideal transformer: (5) For an ideal transformer, the ratio of the induced voltage to the applied voltage is just the ratio of the number of turns in the secondary coil to the number of turns in the primary coil. Since not all transformers are ideal, because not all of the magnetic flux from the primary coil necessarily flow though the secondary coil, the coupling (ç) between coils describes how much of the magnetic flux of the primary coil flows through the secondary coil. How well a transformer is couples determines the transformer’s coefficient of coupling, ç, which is defines by: (Ç= something) An ideal transformer has perfect coupling and ç of 100%. ... The last part of the experiment deals with Transformers. ... The third part of the experiment dealt with Transformers. |
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Title: Faraday s Law and Transformers
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