A (iejdbc)

Race #37

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Official speed 65.10 wpm (52.17 seconds elapsed during race)
Race Start January 19, 2019 12:36:30pm UTC
Race Finish January 19, 2019 12:37:22pm UTC
Outcome No win (4 of 5)
Opponents 1. frankxu (108.51 wpm)
2. nicepal (77.51 wpm)
Accuracy 95.0%
Points 48.83
Text #4060102 (Length: 283 characters)

Transformers and most electric motors operate on alternating current. In such devices the flux in the iron changes continuously both in value and direction. The magnetic domains are therefore oriented first in one direction, then the other, at a rate that depends upon the frequency.