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单词 Effective power
释义

Effective power

原声例句
BBC 听力 2013年11月合集

They want to leave Mr ford's mayor in name only, but no effective legislative power and little budget.

参事们希望只保留市长的头衔,但没有实际的立法权,只有少量的预算。

超级大国的兴衰

The Roman Republic was constructed in a way that restricted effective political power to wealthy citizen males, and in its dying years it was controlled by a very small circle of wealthy citizen males.

罗马共和国初建时就将有效政治权利限制在富裕的男性公民之间,在共和国最后时期,国家政治被一小圈富裕男性公民控制。

中文百科

交流电 Alternating current

(重定向自Effective power)
在曝光期内来回移动的照相机对许多固定路灯拍摄到的照片。由于电压的变化,每盏交流电路灯光留下的个别轨迹是虚线。
交流电的波形
旋转磁场发电机
Links: Sinusförmige WechselgrößeRechts: Ihr Quadrat als ebenfalls sinusförmige, aber einen Gleichanteil enthaltende Mischgröße

交流电Alternating Current,缩写:AC)是指大小和方向都发生周期性变化的电流,在一个周期内的运行平均值为零。不同于方向不随时间发生改变的直流电。

通常波形为正弦曲线。交流电可以有效传输电力。但实际上还有应用其他的波形,例如三角形波、正方形波。生活中使用的市电就是具有正弦波形的交流电。

英语百科

Alternating current 交流电

(重定向自Effective power)
Alternating current (green curve). The horizontal axis measures time; the vertical, current or voltage.
High voltage transmission lines deliver power from electric generation plants over long distances using alternating current. These particular lines are located in eastern Utah.
A sinusoidal alternating voltage.

1 = peak, also amplitude,
2 = peak-to-peak,

3 = effective value,

4 = Period
A sine wave, over one cycle (360°). The dashed line represents the root mean square (RMS) value at about 0.707

Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.

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更新时间:2025/6/18 17:38:05