. Journal of electricity. Generator /viaqneric rield p- i inter I inking ba+h 3 wind incjS. an induction coil or a repeating coil), but very few be-come familiar with the complex relations among di-mensions, amounts of copper and iron, efficiency, reg-ulation, cost, etc. In like manner, one need not mas-ter the mathematical theory of inductive interferencein order to appreciate its character. Consider a simple example. A telegraph linewhich runs parallel to a single-phase trolley line isdisturbed by induction. Let us at first pass by the disturbance due to the presence of the electric chargeon
. Journal of electricity. Generator /viaqneric rield p- i inter I inking ba+h 3 wind incjS. an induction coil or a repeating coil), but very few be-come familiar with the complex relations among di-mensions, amounts of copper and iron, efficiency, reg-ulation, cost, etc. In like manner, one need not mas-ter the mathematical theory of inductive interferencein order to appreciate its character. Consider a simple example. A telegraph linewhich runs parallel to a single-phase trolley line isdisturbed by induction. Let us at first pass by the disturbance due to the presence of the electric chargeon the trolley wire, due to its potential difference fromground, and consider now only the disturbance dueto the current which flows in the circuit when a trolleycar is being supplied with energy.* This currenttraverses the generator, trolley wire, car wiring, motor,and rails (on earth). The inductive • effect of thistrolley current on the nearby telegraph line takes placein exactly the same way that energy is transferred. Indicates inter link-ino o-p maqhetic -f ie/c/ Generator ^t^16/ «=■-f ..vvi+h -relecjraph circuit: from the primary to the secondary of a Fig. 1 is shown, schematically, an ordinary trans-former. A current Ix is driven through the primaryby the generator, at voltage Et. This current setsup a magnetic field in the core, which interlinkswith the secondary winding. The variation of Ixchanges the magnetic field through the secondary,inducing an electromotive force E, in it. The sec-ondary being closed through a load, a current I, is setup. Power transformers are so designed that, approx-imately, the primary and secondary voltages are pro-portional to the turns on the two windings, and thecurrents lx and L are inversely proportional to thenumber of turns. In the case of the trolley circuit and parallel tele-graph line, there is only one turn or loop. Thetrolley circuit is, of course, the primary winding, andthe telegraph circuit the secondary. Fi
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Keywords: ., bookcentury1900, bookdecade1910, bookidjo, booksubjectelectricity
