ng (minhtuhay123)

Race #1876

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Official speed 76.97 wpm (52.85 seconds elapsed during race)
Race Start October 28, 2020 3:54:17am UTC
Race Finish October 28, 2020 3:55:10am UTC
Outcome Win (1 of 5)
Accuracy 98.0%
Points 74.41
Text #4060101 (Length: 339 characters)

A train equipped with, say, two dc motors, is started with both motors connected in series to an external resistor. As the speed picks up, the resistor is shorted out. The motors are then paralleled and connected in series with another resistor. Finally, the last resistor is shorted out, as the train reaches its nominal torque and speed.