Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 457
gradually rises from zero at 10 toits maximum value at 15, 270°, and then falling to zero, butin the opposite direction, since the coil is nowT under the oppo-site or S pole. 438 PRAVTK AL ELECTRR ITY The variation of an alternating current may always l>e re-presented by a wavelike curve a*… … Pig. 386. in Fig. 386 has been formed will showthat the ordinate on any point I* is proportional to the sine of the abscissa of that point. Hence it is called a Sifiutoidor sine curve. The ideal pressure curve from an alternator is sinusoidal.Commercial alternators, however, do not generate true…
Electricity · Magnetism
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