Vo
- VOC
- Abbreviation of Volatile Organic Compound.
- Voice Coil
- Coil attached to the diaphragm of a moving coil loudspeaker.
- Void
- Space between particles or material.
- Volatile
- A solid or liquid material that easily vaporizes. A material with a significant vapour pressure.
- Volatile Memory
- A type of memory that loses the numbers stored in it when electrical power is removed from it.
- Volatile Organic Compound
- Organic chemicals and petrochemicals that emit vapours.
- Volcanic Ash
- Lava from a volcano that is in the form of chunks smaller than an apple, about the size of marbles.
- Volcanic Bomb
- A large lump of lava thrown out of a volcano during an eruption.
- Volcanic Dust
- Lava in the form of small, tiny particles thrown from a volcano during an eruption.
- Volcanoes
- Vents or fissures in the earth's crust through which gases, molten rock, or lava , and solid fragments are discharged.
- Volt
- The volt is the SI unit of electromotive force.
- Volt Amperes Reactive
- Unit used to measure reactive power in an AC electric power system.
- Volta, Alessandro, Count (1745-1827)
- He invented the first practical battery using cells made from two kinds of metals; this verified his theory of differing electrical potentials for unlike metals.
- Voltage
- A potential difference causes current to flow in a circuit, no voltage no current.
- Voltage Amplifier
- An amplifier in which the output-signal voltage is greater than the input-signal
voltage.
- Voltage Controlled Crystal Oscillator
- A crystal-based oscillator whose center frequency can be varied with an applied voltage.
- Voltage Diode Detector
- The semiconductor diode in series with the input voltage and the load impedance.
- Voltage Divider
- A precision resistor network that reduces the output voltage of a device.
- Voltage Drop
- Voltage or difference in potential developed across a component due to current flow.
- Voltage Gain
- Ratio of amplifier output voltage to input voltage usually expressed in decibels.
- Voltage Multiplier
- Rectifier circuit using diodes and capacitors to produce a DC output voltage that is some multiple of the peak value of AC input voltage.
- Voltage Regulation
- A measure of the ability of a generator or power supply to maintain a constant output voltage from no-load to full-load operation.
- Voltage Regulator
- A device or design implementation which regulates the electromotive force.
- Voltage Standing Wave Ratio
- In a waveguide, the ratio of the electric field (voltage) at a maximum point to that of an adjacent minimum point.
- Voltaic Cell
- Or more commonly known as a battery.
- Voltaic Efficiency
- The battery discharge voltage divided by the charge voltage.
- Voltaic Pile
- An early battery consisting of disks of dissimilar metals (usually zinc and copper) separated by moist paper or cloth soaked in an electrolyte solution.
- Volt-Ampere
- The amount of apparent power in an electrical circuit, equal to the product of voltage and current.
- Voltampere (VA)
- The product of rms voltage and rms current in an electronic circuit. It is the unit of apparent power in the International System of Units (SI).
- Voltmeter
- A device for measuring voltage across a component in a circuit.
- Volume
- There are a number of derived units of volume in the British system of units and the SI system of units.
- Volume Percentage
- The concentration of a component in a mixture or an element in a compound.
- Volume Thermal Expansion
- Relative change in volume due to temperature change.
- Volume Velocity
- Within acoustics the volume velocity U of a source is the pressure p divided by the acoustic impedance Z.
- Volumetric Efficiency
- Ratio of the volume discharged from a pump to the piston displacement of the pump.
- Volumetric Energy Density
- Volume based energy density.
- Volute Casing
- Spiral shaped casing surrounding the pump or fan impeller that converts velocity energy to pressure energy.
- Vortex
- Any flow possessing vorticity.
- Vortex Shedding
- A phenomenon which can occur when a fluid flows past a flexible structure.
- Vorticity
- A vector measure of local rotation in a fluid flow, defined mathematically as the curl of the velocity vector.
- Vorticity Equation
- A dynamic equation for the rate of change of the vorticity of a parcel, obtained by taking the curl of the vector equation of motion.
- Voussoirs
- The trapezoidal stones that are often used to form a rounded arch.
- VOX
- Voice operated Switch.
- Voyager Probes
- Space probes launched by NASA in 1977. Their official missions were to study Jupiter and Saturn, but the probes were able to continue on.