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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]

(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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  • What, exactly, is voltage? - Electrical Engineering Stack Exchange
    And also if voltage is like gravitational potential energy, how does more voltage mean more current? And here our nice analogy breaks down In this sense voltage is more like pressure in a water pipe
  • What exactly is voltage? - Electrical Engineering Stack Exchange
    The total voltage you get from one out and back, even with a high temperature difference is pretty small By putting many of these out and back combinations together, you can get a useful voltage A single out and back is called a thermocouple, and can be used to sense temperature Many together is a thermocouple generator Yes, those actually
  • Voltage across Vce in a common emitter BJT
    In this case, the voltage across the current source I depends only on R With other words: The voltage across a constant current source depends on the external network only Therefore, the voltage Vce depends on IcRc and Vcc only When there is an emitter resistor Re we have; Vce=Vcc-IcRc-IeRe
  • Do electrons actually flow when a voltage is applied?
    The important thing is this: charge carriers (electrons being one of such) can be used to transmit an electromotive force (usually called just voltage) This is a pretty ordinary concept, really You can push one end of a rod, and transmit a mechanical force to the other end of the rod Does the rod move, when do you this?
  • How much voltage current is dangerous? - Electrical Engineering Stack . . .
    Likewise, if the current and voltage are below a certain level, a person can--given enough time--safely absorb an arbitrarily large amount of electrical energy Further, if voltage is sufficiently low, the amount of current that can flow as a consequence of such voltage will be too low to cause harm
  • How to reduce DC voltage using resistors?
    How would one go about using a 12 V DC power source to power something which needs 4 5 V DC using resistors? Is there a way to determine how much adding a resistor would drop the voltage?
  • power - How is Line and Phase Voltage the same for a Delta connected . . .
    The phase voltage is the voltage across the transformer winding or load element associated with a phase The diagram posted in the question shows three coils that can be assumed to be transformer windings The RY coil is connected to lines R and Y therefore the voltage across that coil is the R-to-Y line voltage It is as simple as that and obvious, so it is rarely spelled out as I have done
  • How are current and voltage out of phase in capacitive circuit?
    We say that in capacitive circuit the voltage and current are out of phase Current is 90 (degrees) ahead of voltage What is the physical explanation for this effect? How can current flow through a
  • Is it okay to use a power supply that provides slightly more voltage . . .
    Any device will only draw as much current as it needs, so long as its power source can supply it However, the laptop adapter's voltage is a full volt above the specified 18 V; this will cause more current to flow into your device, since the voltage has been increased





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