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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
  • 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"
  • 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)
  • 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
  • voltage - Minimum clearance between two traces that have a potential . . .
    What is the recommended clearance that I should have between two traces that have a voltage difference of 1000VDC and 2000VDC? Additionally, is there an equation that I could use to calculate clearance depending on voltage?
  • 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?
  • terminology - Is voltage the speed of electrons? - Electrical . . .
    Current is the amount of electrons passing through a wire Can we say that voltage is the speed of those electrons?
  • 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?





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