Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 27
Q … BOIL IN 5MIN. 33 SEC.DIRE<tT\CURRENT ^ Figs. 1,239 and 1,240.—Relative heating effects of alternating and direct currents. If it take,say five minutes to produce a certain heating effect with alternating current at say 63.7average volts, it will take 33 seconds longer with direct current at the…
Electrical engineering
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