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 346
eancountries frequencies of 50 and 25 cycles per second are common,and 15 cycles are used on certain a-c. electric railways. PRINCIPLES OF ALTERNATING CURRENTS 315 Voltage 215. Phase relations of current and voltage. Wherever analternating e.m.f. sends a current through a circuit, the currentis… … Fig. 217. Curves of e.m.f. and current inphase.
Electricity · Magnetism
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