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Why the units are volt amperes?

Updated: 8/10/2023
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13y ago

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Because the ampere is the SI unit of measurement for electric current. It is defined in terms of the magnetic effect of an electric current -i.e. the force between two, parallel, current-carrying conductors, expressed in terms of newtons per metre length.

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12y ago
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13y ago

The units of power in AC reactive circuits are volt-amperes instead of watts because the voltage and current are not in phase with each other. Volt-amperes is a better indication of how much power a source such as a transformer is supplying, because watts will be less than volt-amperes due to power factor, but that energy still has to be supplied.

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12y ago

Current is charge per time, or coulomb per second. We simplify that as the ampere. This is accepted convention.

An amount of charge is the coulomb.

Energy per charge is joules per coulomb, also known as the volt.

Charge per second is current in coulombs per second, also known as the ampere.

Per Ohm's Law, a current of one ampere with a voltage on one volt requires a resistance of one ohm, also known as one joule-second per coulomb squared, but the term ohm is so more more convenient.

A current of one ampere across a voltage of one volt dissipates a power of one watts, also known as one joule per second.

Memorize this, and you are well on you way to understanding Electricity 101.

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9y ago

It is not derivable from other units. The ampere is defined in terms of a quantity of electrons flowing past a point per second. A quantity of electrons has no connection to any other unit, it requires a means of counting (or at least estimating) the number of electrons that moved.

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13y ago

Because the French Physicist Ampere did a lot of important research and published

a lot of new knowledge relating to electric current, so when it came time for the

scientific community to define and name new units, they immortalized his memory

by perpetuating his name as the unit of current. But of course, the whole thing was

just a twist of fate, as so many of life's developments are. Had the discoveries been

realized and published by one of his young lab assistants instead of by Professor

Ampere himself, we might be measuring electric current today with a Schwartzmeter,

a Winkelmeter, a Cohenmeter, a Chevaliermeter, etc. The mind boggles at the thought

of how close we came.

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13y ago

It is called Ampere. As to why, well, I guess there must be SOME standard for current.

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11y ago

Presumably the currently used definition was chosen because it can be reproduced with greater precision than alternate methods.

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Q: Why the units are volt amperes?
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Related questions

Is The units of electric current is the volt?

NO! (the units of electric current is Amperes).


What combination of units is equivalent to the amperes?

The unit of measure for voltage is volt. Ohm measures resistance.


What is fullform of MVA?

milli volt amperes, unless it's MVA then it is Mega Volt Amperes. Such as in the use of large transformers


How do you calculate volts with volt amperes?

Divide the circuits amperage into the volt amps and you will get the voltage.


What does ma va stand for in electrics?

mA means milli-amperes VA means Volt-amperes


If you multiply electric current times resistance what will it be in units?

That depends on what units you use as input. If you put in current in Amps and Resistance in Ohms you will get voltage in Volts.AnswerCurrent is measured in amperes. Resistance is measured in ohms, which is a special name given to a volt per ampere. Multiply amperes by (volts per ohm), and you are left with volts.


How you find ups watts?

It is expressed in Volt-Amperes not Watts.


What is the rating in KVA for a desktop computer?

If a device doesn't give its power rating in kVA (or VA), then it can be calculated pretty easily: (volt-amperes) VA = V (voltage) x A (maximum amperage) (kilovolt-amperes) kVA = VA (volt-amperes) / 1000


What does the letters MVA represent in electrical terms?

Mega volt amperes


Ammeter what units does it use?

Amps or amperes


What is meant by the KVA rating?

The symbol, kV.A (not 'KVA'!) represents 'kilovolt amperes', and is a multiple of the volt ampere, used to measure the apparent power of an a.c. circuit, that is the product of supply voltage and load current.Apparent power (expressed in volt amperes) is the vectorial sum of a load's true power (expressed in watts) and its reactive power (expressed in reactive volt amperes).


What is the amperes of the 300 volt battery for the GMC Hybrids?

240 amps AC