how? (haotingz)

Race #37

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Official speed 78.09 wpm (43.49 seconds elapsed during race)
Race Start January 4, 2019 8:18:45pm UTC
Race Finish January 4, 2019 8:19:29pm UTC
Outcome No win (2 of 5)
Opponents 3. mattattack1223 (77.52 wpm)
Accuracy 98.0%
Points 58.57
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.