An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 362
voltage values change at thesame instant, and thus the product is always a product of twopositive values or of two negative values. Therefore, when the current and voltage are in phase, thepower is all positive. The average power expended in such acircuit is represented by the height of the line… … 332 ELECTRICITY AND MAGNETISM
Electricity · Magnetism
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