Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 45
t is flowing in the coil, and is therefore atemporary magnet. A convenient rule for determining the polarity of anelectromagnet when the direction of the current in the coilis known, is shown in Fig. 34. This is the rule for the direc-tion of the flux about a conductor backward. If the coil… … Fig. 34.—Eight-hand rule for determining polarity of electromagnet. north pole of the electromagnet. This is a convenient rule,often used, and an easy one to remember. CHAPTER IIIFUNDAMENTALS OF THE ELECTRIC CIRCUIT Production of Voltag-e.—Electricity is an invisible agentthat manifests itself in…
Electric machinery
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