abc (ilovephysics)

Race #13

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Official speed 45.85 wpm (74.07 seconds elapsed during race)
Race Start May 21, 2020 6:54:04pm UTC
Race Finish May 21, 2020 6:55:18pm UTC
Outcome No win (4 of 5)
Accuracy 93.0%
Points 34.39
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.