International Library of Technology · Scranton, International Textbook Co. · leaf 249
ly 90° behindthe E. M. F. The primary current of a transformer work-ing with its secondary on open circuit is a practical exampleof a current which represents very little energy. Such acurrent at right angles to the E. M. F. is, for the abovereasons, known as a ^svattless current, because the… … FiG. 1490. the circuit is zero. If the angle of lag becomes greater than90°, the greater part of the work becomes negative, as shown (It-
Electrical engineering
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