一个风和日丽 (wwwwwwxjdj1)

Race #174

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Official speed 42.06 wpm (80.74 seconds elapsed during race)
Race Start March 30, 2020 8:10:38am UTC
Race Finish March 30, 2020 8:11:59am UTC
Outcome No win (3 of 3)
Accuracy 93.0%
Points 31.54
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.