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voltage 音标拼音: [v'oltədʒ] [v'oltɪdʒ] n. 电压,伏特数 电压,伏特数 voltage 电压调整率 voltage 电压 voltage n 1: the rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts [synonym: {voltage}, {electromotive force}, {emf}] 2: the difference in electrical charge between two points in a circuit expressed in volts [synonym: {electric potential}, {potential}, {potential difference}, {potential drop}, {voltage}] Voltage \Vol"tage\, n. (Elec.) Electric potential or potential difference, expressed in volts. [1913 Webster] force" (EMF)) A quantity measured as a signed difference between two points in an electrical circuit which, when divided by the {resistance} in {Ohms} between those points, gives the current flowing between those points in {Amperes}, according to {Ohm's Law}. Voltage is expressed as a signed number of Volts (V). The voltage gradient in Volts per metre is proportional to the force on a charge. Voltages are often given relative to "earth" or "ground" which is taken to be at zero Volts. A circuit's earth may or may not be electrically connected to the actual earth. The voltage between two points is also given by the charge present between those points in {Coulombs} divided by the {capacitance} in {Farads}. The capacitance in turn depends on the {dielectric constant} of the insulators present. Yet another law gives the voltage across a piece of circuit as its {inductance} in {Henries} multiplied by the rate of change of current flow through it in Amperes per second. A simple analogy likens voltage to the pressure of water in a pipe. Current is likened to the amount of water (charge) flowing per unit time. (1995-12-04)
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