By Charles George Lamb

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This can be a replica of a publication released earlier than 1923. This ebook can have occasional imperfections reminiscent of lacking or blurred pages, bad photos, errant marks, and so on. that have been both a part of the unique artifact, or have been brought through the scanning strategy. We think this paintings is culturally vital, and regardless of the imperfections, have elected to carry it again into print as a part of our carrying on with dedication to the maintenance of published works around the world.

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The pressure on the coil, ^ m that on Fig. 29. the resistance AB, then we desired phase angle, if the angles be as shown, evidently have X being the Hence the phase angle can readily be found. This method has the advantage that it is not necessary to have any large drop along the series resistance, and hence the ordinary supply pressures are in general sufficient. In such a case when it is evident the drop m is but a small fraction of the pressure that /3 is very small compared with the other angles, and hence the two observations of m and ^ will give X with fair accuracy.

Is The impressed pressure *~23-5 V - Let the same resistance of 5 coil ohms -65 V-~ be connected in series with a non-inductive as shown in Fig. 16. The total resistance ALTERNATING CURRENTS 22 is now 15 ohms and the reactance is, as before, 15, hence the total impedance is 21*2 ohms, that of the inductive part itself being as before 18. If a terminal pressure of 100 volts be the current will be applied, 100/21'2 or 47 amperes, and the angle of lag, A, between this pressure and the current will be evidently 45.

These two lines can be taken as giving either the maximum or the virtual value of the corresponding quantities on scales appropriate to either. It will be seen that if is parallel to OL, then QC is parallel to OR, hence if OL be taken as the direction of the pressure the line OR gives the direction of the current. P=R ; QV QV 22 ALTERNATING CURRENTS 20 that we can adjust the scales of the different such a way that OL shall either represent the maximum pressure in the circuit or the virtual value, which is taken being a matter of convenience.

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Alternating Currents -A Text-Book for Students of Engineering by Charles George Lamb


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