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Extra info for Alternating Electric Currents

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Of one volt, reversing ELECTROMOTIVE FORCES. 37 250 times a second, and, therefore, having a frequency of 250 reversals, or 125 cycles per second, be connected to the ends of the wire, the current strength through wire, many if the wire be wound the into a coil of turns, will be considerably reduced, say to 2 amperes, and the impedance, or apparent resistance of the wire, will be 1-2 ohm, instead of l-5th ohm. > The impedance increases both with frequency and with the number of turns in the coil.

Which was re- direction of the E. quired to produce the flux that caused it. In order to distinguish the E. M. F. pro- ducing the flux, from the E. M. F. produced by the flux, the former is called the M F In other words, the impressed E. passage of magnetic flux through a con. ducting loop, consequent upon the application of an E. M. F. to such loop, will tend to set up in the loop an E. M. F. oppo- sitely directed to that of the E. The induced M. F. quently, called a E. M. F. counter impressed is, electromotive produced by inducsometimes called the counter force; and, since it is tion, it is conse- electromotive force of self-induction.

M. F. produced by the flux, the former is called the M F In other words, the impressed E. passage of magnetic flux through a con. ducting loop, consequent upon the application of an E. M. F. to such loop, will tend to set up in the loop an E. M. F. oppo- sitely directed to that of the E. The induced M. F. quently, called a E. M. F. counter impressed is, electromotive produced by inducsometimes called the counter force; and, since it is tion, it is conse- electromotive force of self-induction. ELECTROMOTIVE FORCES.

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Alternating Electric Currents by Edwin James Houston


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