Vacuum Evaporation - The deposition of thin films of semiconductor material by the evaporation of elemental sources in a vacuum.
Valence Band - The highest energy band in a semiconductor that can be filled with electrons.
Vapor Retarder - A material that retards the movement of water vapor through a building element (walls, ceilings) and prevents insulation and structural wood from becoming damp and metals from corroding. Often applied to insulation batts or separately in the form of treated papers, plastic sheets, and metallic foils.
Variable-Speed Wind Turbines - Turbines in which the rotor speed increases and decreases with changing wind speed, producing electricity with a variable frequency.
Vent - A component of a heating or ventilation appliance used to conduct fresh air into, or waste air or combustion gases out of, an appliance or interior space.
Vent Damper - A device mounted in the vent connector that closes the vent when the heating unit is not firing. This traps heat inside the heating system and house rather than letting it draft up and out the vent system.
Vented Heater - A type of combustion heating appliance in which the combustion gases are vented to the outside, either with a fan (forced) or by natural convection.
Ventilation - The process of moving air (changing) into and out of an interior space either by natural or mechanically induced (forced) means.
Ventilation Air - That portion of supply air that is drawn from outside, plus any recirculated air that has been treated to maintain a desired air quality.
Vent Pipe - A tube in which combustion gases from a combustion appliance are vented out of the appliance to the outdoors.
Vertical-Axis Wind Turbine (VAWT) - A type of wind turbine in which the axis of rotation is perpendicular to the wind stream and the ground.
Visible Light Transmittance - The amount of visible light that passes through the glazing material of a window, expressed as a percentage.
Visible Radiation - The visible portion of the electromagnetic spectrum with wavelengths from 0.4 to 0.76 microns
Volt - A unit of electrical force equal to that amount of electromotive force that will cause a steady current of one ampere to flow through a resistance of one ohm.
Voltage - The amount of electromotive force, measured in volts, that exists between two points.
Volt-Ampere - A unit of electrical measurement equal to the product of a volt and an ampere.
Electro Industries, Inc., 2150 West River Street, PO Box 538,
Monticello, MN 55362 (Map)
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