| 词汇 | ohm |
| 释义 | ohm noun[ C ] physics specializeduk /əʊm/ us /oʊm/ the standard unit of electrical resistance欧姆（电阻单位） Electricity - units A, a amp amperage coulomb electron erg kilowatt lumen megawatt microcoulomb milliampere muon terawatt the Faraday constant volt voltage W, w watt wattage ohm | American Dictionaryohm noun[ C ] us/oʊm/ science the standard unit of electrical resistance (= the degree to which electrical flow is prevented) Examples of ohmohm All impedances were maintained below 5000 ohms and were checked before and after testing. Such a theoretical device would have a zero ohm output impedance in series with the source. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Artifact standards are still used, but metrology experiments relating accurately-dimensioned inductors and capacitors provided a more fundamental basis for the definition of the ohm. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The radiation resistance is typically a fraction of an ohm, making the elementary doublet an inefficient radiator. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A 21 divider probe consists of a 1000 ohm series resistor and a short 50 ohm transmission line. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. From 1900 the mercury ohm was replaced with a precision machined plate of manganin. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Values ranged from fractions of an ohm to 22 megohms. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The definition of the ohm unit was revised several times. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Impedances are 75 ohm single-ended, and 150 ohm differential. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These probes are also called resistive divider probes, since a 50 ohm transmission line presents a purely resistive load. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Electron mobility measurements surpassing one million correspond to a sheet resistance of one ohm per square -- two orders of magnitude lower than in two-dimensional graphene. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The 1893 system had three base units: the international ampere, the international ohm and the international volt. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This high-frequency resistance may vary over a wide range (from 0.1 ohm to 10 k in some cases; the useful range is smaller, though). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A matching transformer should be inserted between any such low-impedance transmission line and the higher 470 ohm impedance of the antenna. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The antenna has very low radiation resistance (less than one ohm) and will rarely be utilized for transmitting. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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