What is voltage?


Voltage, otherwise known as electrical potential difference or electric tension (denoted ∆V and measured in units of electric potential: volts, or joules per coulomb), is the electric potential difference between two points — or the difference in electric potential energy of a unit test charge transported between two points. Voltage is equal to the work which would have to be done, per unit charge, against a static electric field to move the charge between two points. A voltage may represent either a source of energy (electromotive force), or it may represent lost, used, or stored energy (potential drop). A voltmeter can be used to measure the voltage (or potential difference) between two points in a system; usually a common reference potential such as the ground of the system is used as one of the points. Voltage can be caused by static electric fields, by electric current through a magnetic field, by time-varying magnetic fields, or a combination of all three.

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Some articles on voltage:

Transient-voltage-suppression Diode
... A transient-voltage-suppression (TVS) diode is an electronic component used to protect sensitive electronics from voltage spikes induced on connected wires ... device operates by shunting excess current when the induced voltage exceeds the avalanche breakdown potential ... clamping device, suppressing all overvoltages above its breakdown voltage ...
Typical Voltages
... A common voltage for flashlight batteries is 1.5 volts (DC) ... A common voltage for automobile batteries is 12 volts (DC) ... Common voltages supplied by power companies to consumers are 110 to 120 volts (AC) and 220 to 240 volts (AC) ...
Field Emission Display - Operation
... operates like a conventional cathode ray tube (CRT) with an electron gun that uses high voltage (10 kV) to accelerate electrons which in turn excite the ... A high voltage-gradient field is created between the emitters and a metal mesh suspended above them, pulling electrons off the tips of the emitters ... This is a highly non-linear process and small changes in voltage will quickly cause the number of emitted electrons to saturate ...
CV - Engineering, Mathematics, and Science
... value, the amount of heat released during the combustion of a substance Capacitance voltage profiling, a technique to characterize semiconductor materials and devices Cataclysmic variable star ...
Voltage Droop
... Voltage droop is the intentional loss in output voltage from a device as it drives a load ... Employing droop in a voltage regulation circuit increases the headroom for load transients ... that at maximum output current, the output voltage at the load is the minimum acceptable ...

More definitions of "voltage":

  • (noun): The rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts.
    Synonyms: electromotive force, emf