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By Edward Brackett Raymond

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N, the component RI in phase with the current has included in the value R, not only the resistance of the coil but also an amount which, when hysteresis multiplied 2 by 7 gives the , and Foucault currents that may These Foucault or eddy currents may loss due to exist. exist in wires when carrying alternating currents, the effect being negligible with ordinary frequencies, or with small wires, but important enough to be considered in themselves, specific cases when the frequency is high or the size of the wire large.

A watt equals a rate and represents power. joule represents work. : in electricity ; MAGNETISM. 29 Therefore, to bring up a magnetic circuit to a certain degree of magnetism requires the expenditure of a amount certain definite value of Z,, depending upon the can be shown that the amount of work ex- It cuit. of work, the coefficient of self-induction of that cir- pressed in watt-seconds or joules = J L/ 2 , when L is expressed in henrys. The inductance, L, of a circuit is a constant, permeability, /*, of the circuit is a constant.

22 shows a single phase transmission line, and the calculation determines the generator voltage for a If capacity exists in given line and load condition. f. capacity concentrated at a point at the center of the the capacity current there being 90 ahead of the voltage at that point. The calculation transmission line, then consists in determining the voltage necessary at the condenser, to give a certain voltage at the load. Then from this determined voltage determine the volt- age required at the alternator, remembering that from the condenser to the alternator the current in the line differs, line in value between reason, and phase, from the current in the condenser and the load, for the the as stated, that the condenser takes shunts a certain amount of current The above off or from the load.

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