By Charles George Lamb
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Additional info for Alternating Currents -A Text-Book for Students of Engineering
But in the manner just described we can at once determine the power component of that current, and hence it is known not only in be the virtual magnitude, but in phase relation. Thus current and its power component, we evidently have It is ^ ^ COS \ % -F^. THE CHOKING COIL AND TRANSFORMER 51 The angle of hysteretic lead. It can readily be seen that the angle of hysteretic lead is fixed for a circuit when the quality of the iron and the induction is fixed, and is independent of all other factors.
Let a pressure of the virtual value 100 volts be used, then the current will be 100/18 or 5'55 amperes, the virtual effective pressure will be 55'5 volts and the virtual back pressure will be 83'2 volts, the corresponding maximum values being \/2 times as great. A difficulty is sometimes felt in the case where the resistance becomes vanishingly small relative to the reactance. In this case the line OR vanishes but the current still flows in the direction of that line, that in the limit, at right angles to the pressure.
If the source of power be alternating and the small resistance be non-inductive, it is evident that the same is true for the mean power, and hence the electrometer will act as a wattmeter. is and following methods involve the use of a transformer be better understood later on. Take the case where the supply is at low pressure. Let the current be passed through the primary of a transformer T, the secondary of which is closed on a resistance of amount R, and let the connections be made as in Fig.
Alternating Currents -A Text-Book for Students of Engineering by Charles George Lamb