Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 61
hat thevoltage taken up in the resistance represents just so much powerwasted, the loss in watts being simply PR. With a large motor,this loss may be a somewhat expensive matter; with a small one, thesimplicity and convenience largely offset the cost of operation. EXAMPLES FOR PRACTICE 1. The… … Fig. 30. Speed Control by Resistance in Armature Circuit. 48 DIRECT-CURRENT MOTORS 39 2. What is the power loss in the resistance added to the 110-volt motor discussed above? Ans. 2,750 watts. 3. What fraction of the power suppUed to the 250-volt motorabove discussed is wasted in the added…
Electrical engineering
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