| 释义 |
kilovolt|ˈkɪləvəʊlt|
[f. kilo- + volt n.]
a. One thousand volts.
In quot. 1861 the sense is ‘a milliohm’.
1861Electrician 9 Nov. 3/2, 1 Farad per second = 1 Volt, or unit of resistance. 1/1000 Volt = 1 Kilovolt. 1905Nature 7 Dec. 142/1 The disruptive voltage is V kilovolts. 1927Glasgow Herald 8 Dec. 13 Kilovolt transformers. 1938R. W. Lawson tr. Hevesy & Paneth's Man. Radioactivity (ed. 2) v. 65 The hardest characteristic radiation known, viz. the K-radiation of uranium, has a wavelength of 101 X.U. and requires an excitation potential of 115 kilovolts. 1948Sci. News VII. 103 The thickness of metal which can be penetrated is directly related to the kilovoltage of the X-ray set, and a modern portable industrial unit employing 400 kilovolts will penetrate up to 5 inches of steel. 1973Sci. Amer. Nov. 133/1 Bigger sizes are foreseen, but 10 kilovolts at low current is not attractive.
b. attrib. and Comb., as kilovolt-ampere, a unit of apparent electric power, used when an alternating current is not in phase with the voltage, equal to the product of an r.m.s. voltage of 1000 volts and an r.m.s. current of 1 amp; kilovoltmeter, a voltmeter for measuring thousands of volts.
1909Cent. Dict. Suppl., Kilovolt-ampere. 1933Edgcumbe & Ockenden Industr. Electr. Measuring Instruments xxii. 443 These quantities..are directly proportional to the kilo-watts and the reactive kilo-volt-amperes, respectively. 1950Engineering 6 Oct. 281/3 Automatic control is provided to enable either the power factor or the reactive kilovolt-amperes to be maintained constant.
1923R. Knox Radiogr. & Radio-Therapeutics (ed. 4) I. i. 45 The kilovoltmeter for measuring the high-tension current. 1971Stern & Lewis X-Rays xiii. 232 The kilovoltmeter is connected across the primary of the high-voltage transformer.
Hence ˈkilovoltage, voltage expressed in, or of the order of, thousands of volts.
1933Proc. R. Soc. B. CXII. 366 A kilovoltage of 78 was used..to ensure the production of the characteristic K radiation of tungsten. 1948[see kilovolt a above]. 1971Stern & Lewis X-Rays xiii. 233 The quality and quantity of x-ray output for a tube are..not described uniquely in terms of the kilovoltage and milliampere meter readings. |