retro (retroflash)

Race #78

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Official speed 88.70 wpm (38.29 seconds elapsed during race)
Race Start March 9, 2019 2:02:24am UTC
Race Finish March 9, 2019 2:03:02am UTC
Outcome Win (1 of 2)
Accuracy 96.0%
Points 66.53
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.