All articles starting with V
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Voltage imaging
Voltage imaging, also known as voltage-sensitive dye imaging, is an optical method that records membrane potential directly, using fluorescent dyes or genetically encoded indicators to capture spikes in many neurons at once.
Voltage mapping
Voltage mapping is a cardiac electrophysiology technique in which a roving catheter records electrogram voltages across a heart chamber to identify scar and guide ablation.
Voltage multiplier
A voltage multiplier is a rectifier circuit of diodes and capacitors producing a DC output that is an integer multiple of the peak AC input.
Voltage regulator
A voltage regulator, also called a voltage stabilizer or automatic voltage regulator, is a device that holds output voltage constant against changes in input voltage or load conditions.
Voltage regulator module
A voltage regulator module (VRM) is a DC-DC converter that supplies the voltage and current a processor needs, converting 12 V from the power supply down to roughly 1-1.5 V.
Voltage ride-through
Voltage ride-through is the ability of a generator, inverter, or large load to stay connected through short voltage dips, required by grid codes such as IEEE 1547.
Voltage sag
Voltage sag, also called a voltage dip, is a short reduction in AC voltage to between 10 and 90 percent of nominal, lasting from half a cycle to 1 minute.
Voltage spike
A voltage spike is a short, high-magnitude transient rise in voltage on an electrical circuit, lasting microseconds to milliseconds and often reaching tens of kilovolts, caused by lightning, switching, or faults.
Voltage stability
Voltage stability is the ability of a power system to maintain steady, acceptable voltages at all buses after a disturbance; its loss can cause cascading blackouts.
Voltage stability analysis
Voltage stability analysis is a power systems engineering method for assessing whether a grid can maintain acceptable voltages, identifying conditions under which voltage collapse would begin.
Voltage swell
A voltage swell is a short-duration rise in RMS voltage to 110% to 180% of nominal lasting up to one minute, classified by IEEE 1159 as a power quality problem.
Voltage transformer
A voltage transformer, also called a potential transformer, is an instrument transformer that supplies meters and protective relays with an accurate scaled replica of system voltage.
Voltage unbalance
Voltage unbalance, also called voltage imbalance, is a power quality condition in three-phase electrical systems where voltages differ in magnitude or deviate from their ideal 120-degree phase angles.
Voltage-controlled Dzyaloshinskii–Moriya interaction
Voltage-controlled Dzyaloshinskii–Moriya interaction (VCDMI) is the electric-field modulation of the Dzyaloshinskii–Moriya interaction in magnetic heterostructures, pursued as a low-power way to control skyrmions without Joule heating.
Voltage-controlled magnetic anisotropy
Voltage-controlled magnetic anisotropy (VCMA), first reported in 2007, is an effect in which an electric field changes the anisotropy at a ferromagnet-dielectric interface, enabling low-power, voltage-driven magnetic memory writing.
Voltage-controlled oscillator
A Voltage-controlled oscillator (VCO) is an electronic oscillator whose oscillation frequency is controlled by an applied voltage, used widely in phase-locked loops (PLLs) and FM modulators.
Voltage-gated potassium channel
Voltage-gated potassium channel (Kv channel): 40 human genes in 12 subfamilies; tetrameric S1–S6 channels that open on depolarization to repolarize action potentials; targets for epilepsy, autoimmune, and antiarrhythmic drugs.
Voltage-gated sodium channel
Voltage-gated sodium channels (Naᴠ1.1–1.9, NaᴪX) are depolarization-activated sodium pores that initiate action potentials in neurons, muscle, and heart; targets of tetrodotoxin, local anesthetics, and the 2025-approved Naᴠ1.8 analgesic suzetrigine.
Voltage-source converter
A voltage-source converter (VSC) is a power electronic converter that holds a stiff DC bus voltage and synthesizes an AC output by high-frequency switching of IGBTs.
Voltage-source inverter
A voltage-source inverter (VSI) is a power electronic converter that produces AC output from a DC input by switching semiconductor devices, used in motor drives, solar and wind systems, and UPS units.
VoltaGrid LLC
VoltaGrid LLC is a Houston, Texas distributed power company founded in 2020 and led by Nathan Ough, building natural gas microgrids for data centers, oilfields, and industry.
Voltaic pile
The voltaic pile, also known as Volta's pile, is a stack of zinc and copper discs invented by Alessandro Volta in 1799 as the first continuous electric current source.
Voltaic Revolutionary Communist Party
The Voltaic Revolutionary Communist Party (French: Parti communiste révolutionnaire voltaïque, PCRV) is a clandestine Marxist-Leninist party in Burkina Faso, founded in 1978, that has refused participation in every government and election.
Voltaire
Voltaire (François-Marie d'Arouet, 1694–1778), French Enlightenment writer, philosopher, and activist; author of Candide (1759), Lettres philosophiques, and the Dictionnaire philosophique; campaigner for toleration and foe of the 'Infâme'.
Voltaire High
Voltaire High (Mixte) is a 2021 French Prime Video period comedy-drama by Marie Roussin: in September 1963, eleven girls join a boys' lycée in Saint-Jean-d'Angély; one season, canceled, Canneséries audience prize.
Voltairine de Cleyre
Voltairine de Cleyre (1866-1912) was a Michigan-born American anarchist, feminist, poet, and lecturer, contemporary of Emma Goldman, author of 'Sex Slavery' and 'Direct Action', who evolved from individualist anarchism to anarchism without adjectives.
Voltalia
Voltalia is a France-based independent renewable energy producer headquartered in Paris. Founded in 2005, it operates about 2.9 GW of capacity across 15 regions on three continents.
Voltalis
Voltalis is a French energy company, created in 2006 and headquartered in Paris, that installs free connected thermostats and sells aggregated demand-response flexibility to grid operators.
Voltammetry
Voltammetry, also known as polarographic analysis or voltamperometry, is a family of electroanalytical techniques that control electrode potential and measure the resulting current, plotted as a voltammogram.
Voltas
Voltas Limited is an Indian air conditioning and engineering solutions company in the Tata Group, founded in Mumbai in 1954 and India's largest AC seller by market share.