Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 30
mes. This is called thee.g.s. unit of current; the practical unit, called the ampere, is equal to one-tenth of a c.g.s. unit. 9. Electromagnets.—The loop carrying current, shown inFig. 7, acts like a magnet and is called an electromagnet. The … Fig. 8.—The polarity of an electromagnet. strength of an electromagnet may be increased by increasingthe current or, as in Fig. 8, by increasing the number of turns.The direction of the magnetic field may be conveniently found byanother corkscrew law which states that if the head of the workscrew…
Electrical engineering
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