# volt +

#### (unit of measurement of electromotive force, or pressure, in an electrical circuit, or 'push', named for Alessandro Volta (1745-1827) renowned for his pioneering work in electricity)

starting voltage
The voltage required for a radiation counter to function.
supervoltage
In radiation therapy, voltage between 500 kilovolts and one megavolt.
teravolt
One trillion volts.
thermophotovoltaic cell (TPV)
A device concentrating sunlight onto a absorber that heats it to a high temperature.

The thermal radiation emitted by the absorber is used as the energy source for a photovoltaic cell that is designed to maximize conversion efficiency at the wavelength of the thermal radiation.

threshold voltage
1. The minimum voltage that must be applied to an electronic device to produce a particular operating characteristic.
2. The minimal voltage at which all the pulses produced by an ionizing even are of the same size regardless of the magnitude of the event.
vault, volt
vault (VAWLT) (noun)
1. An arched structure that forms a ceiling or roof: "All the tourists gazed at the vault of the cathedral before continuing their tour of the church."
2. A locked room where money or valuable things are kept: "I had never been in the bank vault before."
vault (VAWLT) (verb)
To jump over something, especially to jump over something by using your hands or a pole to push yourself upward: "He was able to vault over the fence easily."
volt (VOHLT) (noun)
1. A unit for measuring the force of an electrical current: "Do you have a nine-volt battery that I could use?"
2. A quick jump or movement during fencing to avoid a thrust: "The fencing master taught the students how to use the volt so their opponents couldn't score."

When the man was exploring the ancient vault under the market square, he carried a nine volt battery for his portable light so he could see if he needed to vault over the broken stones.

volt ampere hour, volt-ampere hour
1. A unit for expressing the integral of apparent power over time, equal to the product of 1 volt-ampere and 1 hour, or to 3600 joules.
2. A unit for the integral of apparent power over time, equal to the product of one volt-ampere and one hour.
volt ampere, volt-ampere, VA
1. A standard unit of apparent power, equal to the product of one volt and one thousandth of an ampere (milliampere).
2. An electric measurement unit, equal to the product of one volt and one ampere, equivalent to one watt for direct current systems and a unit of apparent power for alternating current systems.
3. A unit of electric measurement equal to the product of a volt and an ampere that for direct current constitutes a measure of power equivalent to a watt.
volt per meter, V/m
The Système International [d'Unités] (International System [of Units]) derived unit of electric field strength; 1 volt/1 meter = 1 newton/1 coulomb.
volt, V
1. A unit of measurement of force, or pressure, in an electrical circuit.

The common voltage of an AC power line is 120 volts of alternating current (alternating directions) while common voltages within a computer are from 3 to 12 volts of direct current (one direction only).

2. The unit of potential difference or electromotive force in the meter-kilogram-second system, equal to the potential difference between two points for which one coulomb of electricity will do one joule of work in going from one point to the other.

Electric potential is the amount of work needed to move a unit charge from a reference point to a specific point against an electric field. Typically, the reference point is the earth, although any point beyond the influence of the electric field charge can be used.

3. A standard unit of potential difference or electromotive force equivalent to the potential difference between two points requiring one joule of work to move one coulomb of electricity from the point of lower potential to the point of higher potential. 4. 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.
5. The standard unit used to measure how strongly an electrical current is sent around an electrical system.
voltage
1. The electromotive force, potential, or potential difference, measured in volts, which causes current to flow in an electric circuit>
2. The potential difference between two electrodes, as measured in volts.
3. The rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts.

Voltage is often compared to water pressure or are often given relative to "earth" or "ground" which is taken to be at zero volts. A circuit's earth may or may not be electrically connected to the actual earth.

4. A term sometimes used interchangeably with electrical potential.

The electrical potential difference between two points in a circuit is the cause of the flow of a current.

Voltage is measured in volts, millivolts, microvolts, and kilovolts and the terms electromotive force, potential, potential difference, and voltage drop are all often called voltage.

voltage amplification (s) (noun), voltage amplifications (pl)
The increasing of an input-signal voltage to produce a higher output-signal voltage: "The ratio of the magnitude of the voltage amplification across a specified load impedance to the magnitude of the input voltage of the amplifier or other transducer feeding that load is often expressed in decibels by multiplying the common logarithm of the ratio by 20."
voltage amplifier
1. An electronic circuit whose function is to accept an input voltage and produce a magnified, accurate replica of this voltage as an output voltage.

The voltage gain of the amplifier is the amplitude ratio of the output voltage to the input voltage.

2. An amplifier designed primarily to build up the voltage of a signal or to increase a signal's voltage, without supplying appreciable power.
voltage attenuation
The ratio of the magnitude of the voltage across the input of a transducer to the magnitude of the voltage delivered to a specified load impedance connected to the transducer.

It is expressed in decibels by multiplying the common logarithm of the ratio by 20.

voltage calibrator
A voltage source that provides an adjustable high-accuracy calibration voltage for calibrating measuring instruments.

A cross reference of word units that are related, directly and/or indirectly, with "electricity": electro-; galvano-; hodo-; ion-; piezo-; -tron; biomechatronics, info; mechatronics, info.