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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 - 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
  • Is it okay to use a power supply that provides slightly more voltage . . .
    To come up with this, dividing the sign's required current (2A) by its required voltage (18V) yields an expected load resistance of 9ohms; to get the same 2A current from a 19V source requires a resistance of 9 5ohms; then, accounting for a 1V drop across you 0 5ohm resistor at 2A, we see that the resistor should regularly be dissipating 2W of
  • voltage - Minimum clearance between two traces that have a potential . . .
    The accepted creepage distance depends on the Comparative Tracking Index (CTI) of the pcb material (in the table it is the "material"), on pollution degree, if traces are on the same or different layers, if the required insulation is Basic, Functional, Double (or Reinforced), that depends on the working voltage of the connected circuits, also
  • What are the highest DC and AC voltages or currents that can be . . .
    It's more than enough voltage to cause enough current to kill you if applied below the skin surface, through your heart High voltage at limited current or limited energy is not generally a problem- a static charge in the thousands of volts typically only causes a bit of discomfort For most purposes, 24VDC or lower will be considered safe enough
  • 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)
  • 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\$ –
  • 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





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