use appropriate username (waht315)

Race #1555

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Official speed 127.72 wpm (26.59 seconds elapsed during race)
Race Start May 19, 2019 1:57:51pm UTC
Race Finish May 19, 2019 1:58:17pm UTC
Outcome Win (1 of 3)
Opponents 2. billypeppin (81.22 wpm)
Accuracy 99.0%
Points 95.79
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.