The harmonic problems, such as distorting supply voltage, decreasing power factor, increasing energy loss, interfering with communication systems etc. are discussed in the part one.

第一部分讨论各种谐波问题，如使供电电压畸变，降低功率因数，增加能量损耗，干扰通讯系统等。

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The paper introduces the technique feature and the operation principle of chip CS5460A, and its application in high-accuracy power frequency voltage, current, power, power factor, frequency meter.

本文介绍了CS5460 A芯片的特点、工作原理及其在高精度工频电压、电流、功率、功率因数、频率表中的应用。

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Voltage is the essential factor that the color of film varies orderly with the change of voltage.

电压是影响膜层色彩的最主要的因素，颜色随着电压的变化而发生规律性的改变。

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By monitoring the line voltage, frequency and power factor, you can check the quality of the electricity you are being charged for and yell at the utility for delivering a shoddy product if it is below specification (not that it will do you any good).

ECONOMIST: The much-talked-of smart grid prepares to enter the home

With Internet-delivered music, Dolby's noise-reduction matters more now than in 1965, when Dolby first observed that the voltage of hiss in audiotape outmatched the music by a factor of 1, 000 to 1.

FORBES: Aural Surgery