Arman (arman15)

Race #463

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Official speed 68.55 wpm (59.34 seconds elapsed during race)
Race Start September 7, 2020 10:33:26am UTC
Race Finish September 7, 2020 10:34:26am UTC
Outcome No win (2 of 4)
Accuracy 95.0%
Points 66.27
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.