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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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  • voltage - Ground vs. Earth vs. common vs. negative terminal . . .
    Voltage and Current In electricity there are positive charges (usually protons) and negative charges (usually electrons When one object is positively charged, and another is negatively charged, then there exists an electrostatic field This is the voltage, or the potential for charge to be able to be moved by the electrostatic field
  • voltage - What is the difference between Vrms and Vm? - Electrical . . .
    The RMS value of a waveform is the DC-equivalent voltage It means, that if you have a sine wave with an RMS value of 10 volts RMS, in order to deliver the same power via DC voltage, you would need 10 volts DC Don't confuse the average magnitude with the RMS voltage; V av does not equal V rms In fact, technically, the average voltage of an
  • voltage - What is the difference between RMS and DC? - Electrical . . .
    The RMS voltage is about 1 11 times higher than the average for a sine wave A cheap multimeter on AC current and voltage ranges will full-wave rectify the input signal and then display a number 1 11 times higher than the actual voltage to give the user an approximately correct number for a sine wave input
  • voltage - Explain in laymans terms Vgs and Vgs(th) of MOSFETs . . .
    Vgs(th) is the voltage at which the mosfet channel begins to conduct At this voltage, a positive voltage, it creates an electric field, which attract electrons (since our applied voltage is positive, so positive charges on gate) These accumulated electrons near the gate, form a bridge between the source and the drain (which are both n type)
  • Why does the USA use 110V and UK use 230-240V?
    The only difference is that we ground it in the center, creating "split" phases, reducing the peak voltage relative to ground and making it easier to interface low-power loads But high-power loads (stoves, water heaters, clothes dryers, etc ) operate across the full voltage, reducing the current required \$\endgroup\$ –
  • voltage - What is the difference between a linear regulator and an LDO . . .
    Linear regulators control the output voltage by adjusting the current through an output transistor In all linear regulators, there is a minimum difference between the input voltage and the output voltage that you have to maintain Take the ancient 7805 linear regulator It needs the input voltage to be at least 2V higher than the output voltage
  • Volts vs voltage - Electrical Engineering Stack Exchange
    Voltage is a difference of electric potential To simplify, it is an measure of the difference in concentration of electrons between two points Volts is a unit of measure of voltage It would be pretty difficult to have exactly no electron on an electrode, and as the voltage is the difference of potential, it is always relative to somthing
  • voltage - Current source with a grounded load and floating power supply . . .
    Basic op-amp current source (floating load) 𝑉 in might come from a voltage divider, or it could be a signal that varies with time 𝐼 load is easy to calculate in this situation The problem with this circuit is that the load is floating (neither side is grounded )
  • What exactly does common-mode mean in the context of op-amps?
    But the average voltage of the two is still 5 V, and more importantly, we don't care about that The signal of interest is the difference between the two sides, i e 5 025 V - 4 975 V = 50 mV So we use a differential amplifier to take the difference (and probably multiply it by some gain factor)





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