The practical testing of dynamos and motors (1905)
Smith, Charles Frederick, 1873- · Manchester Scientific Pub. Co · leaf 24
e given inelectrical text books, and need not be repeated here. Before describing the more delicate methods ofresistance measurement, the following simple method,which is often sufficiently accurate for small machineswhose armature resistance is not too low* is given. Theinstruments required are a… … -—J\N\f\I\j—--RFig. 2.—Measurement op Armature Resistance. See footnote, page 13. 10 MEASUREMENT OF RESISTANCES. D Dynamo armature (stationary). R Resistance. C Source of current—either 2 or 3 secondary cells orpower mains. A Ammeter. V Voltmeter. S Switch. Connections—Connect in series with the…
Dynamos · Electric motors
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