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| AC (Electric current that reverses its direction of flow (polarity) periodically according to a frequency measured in hertz, or cycles per second. The rapid change from positive to negative electricity of 60 or more times each second); alternating current (Electric current that reverses its direction of flow (polarity) periodically according to a frequency measured in hertz, or cycles per second. The rapid change from positive to negative electricity of 60 or more times each second) | |||
| Wechelstrom: 2 phrases in 1 subject |
| Metallurgy | 2 |