International Library of Technology · Scranton, International Textbook Co. · leaf 306
e vane lies at an angle to the lines of force that,when a current flows, thread through the coil as shown bythe arrows. As soon as a field is set up through the coil,the wane swings around so that it tends to lie parallel to thelines of force, as indicated by the dotted lines v, thus givinga… … 12. Potential Transformers.—It is not usual to con-nect voltmeters of the ordinary type directly across the lineon alternating-current boards, becausethe pressure is so great that a voltmeterwould have to have an exceedingly highresistance to permit its being so con-nected. Of course, if the…
Electrical engineering
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