Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 398
^ the gradual in-crease in the brilliancy of a lamp connected to the brushes,called a pilot lamp, when any direct current dynamo starts togenerate. Ten to twenty seconds may J?e required from thetime the field switch is closed until the armature generates itsfull voltage. A machine may refuse to… … 380 PRACTICAL ELECTRICITY. Prob. 124: The resistance of the armature of a dynamo is .15 ohmand that of the field magnets, 100 ohms. With open fields the arma-ture generates 6 volts, due to the residual magnetism. What currentwill now around the field to start the building-up process when thefield…
Electricity · Magnetism
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