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voltage |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Voltage \Vol"tage\, n. (Elec.) Electric potential or potential difference, expressed in volts. From WordNet r 1.6 [wn]: 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 [syn: {electromotive force}, {emf}] 2: the difference in electrical potential between two points in a circuit expressed in volts [syn: {potential difference}, {potential drop}] From The Free On-line Dictionary of Computing (13 Mar 01) [foldoc]: voltage(Or "potential difference", "electro-motive 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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