Electricity experimentally and practically applied; a book for the beginner and for the practical man, principles, experiments, practical applications and problems (1910)
Ashe, Sydney Whitmore · New York, D. Van Nostrand company · leaf 273
CIPLES OF ALTERNATING CURRENTS 251 curve into rectangles, and calculate as closely as possible itsarea. If a planimeter is at hand, it may be used to obtainthe area. Having determined the area in square inches,divide the area by the abscissa, or the length along the zeroline between two successive… … Fig. 318. Interior of Weston Alternating Current Voltmeter. value. Extracting the square root of this quantity willgive the effective value, or the square root of the mean squarevalue. An effective current value of 100 amperes alternat-ing current would have the same heating effect as 100 am-peres…
Electricity · Electrical engineering
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