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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
    What is voltage? It's a stack of invisible membranes which fill the space between charged capacitor plates Voltage is the pattern of concentric onion-layers which surround any charged object, with the onion-layers running perpendicular to the flux-lines of the electric field So, 'stacks of voltage-layers' is one way of describing an electric
  • How much voltage current is dangerous?
    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 \$\endgroup\$ –
  • 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
  • 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 - 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
  • voltage - Whats does hr mean among V and Ah in batteries . . .
    It means that the battery has a capacity of 25 Ah when discharged in 10 hours 25 Ah is 25 Amps for 1 Hour which is equivalent to 2 5 Amps in 10 Hours
  • datasheet - Noise and what does V √Hz actually mean? - Electrical . . .
    To convert the spectral density \$\tilde v\$ (in nV √Hz) to a voltage (in V RMS), you need to multiply it by the square root of the bandwidth: $$ v_\mathrm{RMS}=\tilde v \cdot \sqrt{\Delta f} $$ For example, if the op-amp is a TLC071, with equivalent input noise voltage density of 7 nV √Hz, and audio bandwidth, the total equivalent 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)





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