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Alternating Current -Engineering Practically Treated by Edward Brackett Raymond

By Edward Brackett Raymond

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F. tion. It is in Fig. f. (Fig. the fact that cur- by 70. 2 or /2 + 2 Fig. this for the case in Fig. 10 n, which expresses by geometry in and the line 1-3, shows the actual opposing customary to show the summa- The diagram showing shown forces. f. f. ' In the alternating current circuit, takes the place of resistance alone. therefore, IMPEDANCE. 25 IMPEDANCE. In alternating sum which takes the place The value 2 irnL ohms when L impedance. is square root of the resistance and the value of the squares of of 2 jrnL, circuits this value, expressed in X turns = flux We thus X io T1T o of resistance, is called is called reactance, is , ,, and expressed in henrys 1A have, in alternating circuits, - 8 amp.

2 or /2 + 2 Fig. this for the case in Fig. 10 n, which expresses by geometry in and the line 1-3, shows the actual opposing customary to show the summa- The diagram showing shown forces. f. f. ' In the alternating current circuit, takes the place of resistance alone. therefore, IMPEDANCE. 25 IMPEDANCE. In alternating sum which takes the place The value 2 irnL ohms when L impedance. is square root of the resistance and the value of the squares of of 2 jrnL, circuits this value, expressed in X turns = flux We thus X io T1T o of resistance, is called is called reactance, is , ,, and expressed in henrys 1A have, in alternating circuits, - 8 amp.

42 around with the opposite magnetizing force until a considerable amount of it has been consumed to agree turning them. Simultaneously with this turning around, we get the loss called hysteretic or "core loss," in mentioned before, due to the rubbing of molecules of iron on one another. This curve is called the " hysteresis loop," and closed by the lines is is E From per cycle. wave it repeated, can be shown that the area in- a measure of the hysteresis loss onward, the upper half of the but in a negative direction.

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