A voltage controller, also called an AC voltage controller or AC regulator is an electronic module based on either thyristors, TRIACs, SCRs or IGBTs, which converts a fixed voltage, fixed frequency alternating current (AC) electrical input supply to obtain variable voltage in output delivered to a resistive load.

Voltage drop is the decrease of electrical potential along the path of a current flowing in an electrical circuit.

n electrical engineering, particularly power engineering, voltage regulation is a measure of change in the voltage magnitude between the sending and receiving end of a component, such as a transmission or distribution line.

A voltage regulator is a system designed to automatically maintain a constant voltage.

A voltage source is a two-terminal device which can maintain a fixed voltage.

VSC HVDC systems use insulated-gate bipolar transistors to provide switching ability of the IGBTs to on and off many times per cycle in order to improve the harmonic performance and removing the requirement for synchronous machines in the AC system for its operation.

The voltaic pile was the first electrical battery that could continuously provide an electric current to a circuit.

A voltmeter is an instrument used for measuring electric potential difference between two points in an electric circuit.

The total volume of water displaced by the ship.

Volumetric efficiency in internal combustion engine engineering is defined as the ratio of the mass density of the air-fuel mixture drawn into the cylinder at atmospheric pressure to the mass density of the same volume of air in the intake manifold.

In physics and engineering, in particular fluid dynamics, the volumetric flow rate is the volume of fluid which passes per unit time; usually it is represented by the symbol Q.

The heat capacity of a sample of the substance divided by the volume of the sample.

In fluid dynamics, a vortex is a region in a fluid in which the flow revolves around an axis line, which may be straight or curved.

A vortex generator is an aerodynamic device, consisting of a small vane usually attached to a lifting surface (or airfoil, such as an aircraft wing) or a rotor blade of a wind turbine.

A wake created due to the reduction of wind speed after it crosses a turbine blade.

In continuum mechanics, vorticity is a pseudovector field that describes the local spinning motion of a continuum near some point (the tendency of something to rotate, as would be seen by an observer located at that point and traveling along with the flow.

A maritime “black box”. VDR is usually two-part system consisting of a data collecting unit, and a protected storage unit that stores the retrieved data.