| 单词 | power factor |
| 释义 | > as lemmaspower factor power factor n. (a) the ratio of the actual electrical power delivered by an a.c. circuit (or a component in it) to the product of the root-mean-square values of current and voltage, often expressed as the cosine of the phase difference between current and voltage; (b) (as a property of an insulating material) this ratio under specified conditions of a capacitor made with the insulating material as dielectric. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > circuit > [noun] > alternating circuit > ratio power factor1892 the world > matter > physics > electromagnetic radiation > electricity > transmission of electricity, conduction > non-conduction, insulation > [noun] > substance or contrivance > property of tension1785 isotropy1888 power factor1892 1892 J. A. Fleming in Jrnl. Inst. Electr. Engineers 21 606 The ninth column gives a number which it is convenient to call the power-factor of the transformer at no load—it is the ratio of the true to the apparent watts. If the currents and pressures were simple sine functions, then the power-factor in that case would be the cosine of the angle of lag of primary current behind the primary terminal potential difference. 1912 J. A. Fleming in Jrnl. Inst. Electr. Engineers 49 323 The power factor and conductance of dielectrics under alternating electromotive force of low voltage. 1967 M. Chandler Ceramics in Mod. World iv. 133 It [sc. zircon porcelain] has not only a low power factor, but also good electrical properties in general. 1992 RS Components: Electronic & Electr. Products July 553/2 Power factor correction is provided by the RS range of lighting capacitors. < as lemmas |
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