This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...force, the current will have a certain value and a certain phase position with reference to the electromotive force, as discussed in Exp. 4-A. I=E R + X2; ta.ne = X- -R. These values of current and phase angle will be changed, if either the resistance or the reactance of the circuit is changed. 2. In a circuit ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...force, the current will have a certain value and a certain phase position with reference to the electromotive force, as discussed in Exp. 4-A. I=E R + X2; ta.ne = X- -R. These values of current and phase angle will be changed, if either the resistance or the reactance of the circuit is changed. 2. In a circuit in which the reactance X is constant, and the resistance R is varied, the value of / and 6 will increase when R is decreased; as resistance is cut out of circuit, the current will, accordingly, not only be larger but will be more out of phase with reference to the electromotive force. In the limiting cases: when R--o, the current is E--X and (in the case of inductive reactance) lags 900 behind the electromotive force; when R--oo, I = o, and 6 = o. 3. The object of this experiment is to show the change of current in magnitude and phase, in a circuit with constant inductive reactance, when the resistance is varied and the impressed electromotive force is maintained constant. It will be found that the locusf of the current vector is the arc of a semicircle, as in Fig. 2; this is true of any constant potential circuit, in which the reactance is constant and the power consumption is variable--as in a transformer (Exp. 5-C) or in an induction motor. ( 3a). A similar experiment may be performed with capacity reactance; see Appendix I., Exp. 4-A. A converse experiment may also be made with constant resistance and variable reactance, in which case the diameter of the semi-circle locus is in the direction of E, instead of at right angles to it; see reference, 3b. t ( 3b). Established by Bedell and Crehore, Alternating Currents, pp. 223 and 275. 4. Data.--Let the circuit be as shown in Fig. 8, Exp. 4-A, in...
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265 pp., book plate, front hinge slightly weak, else very-good. -If you are reading this, this item is actually (physically) in our stock and ready for shipment once ordered. We are not bookjackers. Buyer is responsible for any additional duties, taxes, or fees required by recipient's country.