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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
    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
  • How are current and voltage related to torque and speed of a brushless . . .
    Voltage instead "regulates" how fast a motor can run: the maximum speed a motor can reach is the speed at which the motor generates a voltage (named "Counter-electromotive force") which is equal to the voltage it receives from battery (disregarding power losses and frictions for simplicity)
  • What is forward and reverse voltage when working with diodes?
    The reverse voltage is the voltage drop across the diode if the voltage at the cathode is more positive than the voltage at the anode (if you connect + to the cathode) This is usually much higher than the forward voltage As with forward voltage, a current will flow if the connected voltage exceeds this value This is called a "breakdown"
  • What exactly does common-mode mean in the context of op-amps?
    Most, or maybe all, topologies could end up outside of common mode voltage ranges at some specific time What is important is to understand under what conditions will you be outside of the common-mode voltage range when designing a circuit, and if so will the op-amp you choose still suffice for your application?
  • voltage - What is the difference between Vrms and Vm? - Electrical . . .
    I am relatively new here and I am confused as to the difference between Vrms and Vm I would be obliged if someone can explain (This in relation to 3-phase circuits would be even better) My shot at
  • How much voltage current is dangerous?
    6 It's not the voltage but the current that kills, is a popular yet still incorrect incomplete answer It is the ENERGY that kills With static electricity you will will be exposed to voltages much, much, much higher than 110 230V and that is not dangerous So obviously high voltages are not that dangerous in some cases Why?
  • Reducing voltage with resistors - Electrical Engineering Stack Exchange
    As others have mentioned you can use a voltage divider of two resistors, but the voltage divider output will change if the load current changes You can still use a voltage divider and fix this problem by adding a buffer to the output of the voltage divider
  • Voltage drop across a single resistor and across two resistors
    An intuitive way to look at is that all the voltage is dropped across two resistors, and since the resistors are the same, the voltage drop across each will be the same, each taking half
  • RMS value calculation of 3 phase line voltages for power calculations
    In my textbook in the power calculations section of the balanced three phase circuits, a part confused me a little bit, it is this part: Why are we dividing by \\$\\sqrt{3}\\$ to find RMS values of \\
  • Does LED brightness change with voltage?
    The voltage only needs to be slightly above the forward voltage rating of the LED A common way to control brightness is through pulse width modulation (PWM) Instead of giving a LED less voltage, to dim it, you give it the full voltage, but in repeating bursts The duty cycle determines brightness





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