Throughout Europe, the standard frequency for alternating current is generally set at 50 cycles per second.

整个欧洲地区，交流电的标准频率通常设定为每秒50周。

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Either direct or alternating current may be used for driving electric trains.

直流电和交流电都可用来驱动电气火车.

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Alternating current reverses from negative to positive about 60 times a second.

交流电由负到正一秒钟大约变换六十次.

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This high frequency alternating current produces the high frequency radio waves mentioned in the previous chapter.

这种高频交流电流产生前一章提到过的高频无线电波.

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A device used to convert current into alternating current.

反用换流器用于变直流电为交流电的仪器.

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Electronic instrument generally uses rectified and filtered AC current as power source.

电子仪器的电源,一般由交流电整流滤波而来.

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A. C . can be changed into D, C . or vice versa.

交流电能变成直流电, 反过来直流电也能变成交流电.

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Plug in the AC adapter and restart your notebook.

插入交流电适配器并重新启动笔记本电脑.

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Are comprised of three - phase AC systems operating essentially at constant voltage.

由稳态电压下的 三相 交流电运行系统组成.

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The AC outlet is housed in robust aluminum housing.

该交流电插座封装在坚固的铝制外壳内.

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Alternating current is the current whose direction changes periodically.

交流电是其方向周期地变化的电流.

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This type of MP 3 player cannot be connected to alternating current.

这款MP3播放机不可以直接插交流电使用.

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The NIBCO NEV series solenoid valves are 110 VAC, NAMUR standard units.

NIBCO尼伯克NEV系列电磁阀是110伏交流电, NAMUR标准装置.

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A rectifier is a device which changes AC to DC.

整流器是一种将交流电转变为直流电的装置.

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Arcs more readily than AC welders, with longer arcing.

起弧比交流电容易, 电弧加长一倍.

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