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.
| Game | Time | WPM | Accuracy |
|---|---|---|---|
| 19765 | 2020-02-18 14:44:30 | 83.81 | 97% |
| 16657 | 2019-01-04 03:08:41 | 86.10 | 99% |