The Alternate Current Transformer in Theory And Practice
The Alternate Current Transformer in Theory And Practice
John Ambrose Fleming
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In virtue of the fact that such a device merely translates the form of electric energy, or can be made so to do, in changing a current of high electromotive force into one of low, or vice versd, it has in its practical applications with periodic currents been called a Transformer, or frequently also MUTUAL AND SELF INDUCTION. 269 a Converter. The general problem of the induction coil with a magnetic circuit of constant permeability has already been treated on the assumption that the constants c...alled the coeffi- cients of induction are known and numerically given quantities. As, however, the presence of iron renders these coefficients variable and dependent on the induction it is preferable to handle the problem of transformers with iron cores in a different manner. We shall first follow the method of investigation employed by Mr. Kapp (loc. Cit. ), * altering, however, the treat- ment in several details. If two electric circuits are linked with a magnetic circuit of variable permeability forming a chain of three links (see Fig.
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