How ampere is defined and what does ampere mean

The unit of current is ampere, and its determination is: ampere is a constant current, in a vacuum, when two parallel circular straight wires with a negligible cross-sectional area of 1m apart are passed with an equal amount of constant current, if the interaction force between the wires is 2 10-7n per meter length, then the current in each wire is 1a. This definition was approved at the 9th International Conference on Weights and Measures in 1948, and at the 11th International Conference on Weights and Measures in 1960, the ampere was officially adopted as one of the basic units of the International System of Units.

Second, defined as the duration of the transition radiation between two ultrafine energy levels of the ground state of the cesium-133 atom for 9192631770 cycles at zero magnetic field.

Coulombs are the amount of electricity that passes through the cross-section of the wire after one second of current passing through one amperere of wire.

Andre Marie Ampere (1775-1836) was a French physicist. His early years in mathematics included the study of probability theory and partial differential equations, and his essay on the mathematics of gaming opportunity caught d'Alembert's attention. Later, he did some chemical research, and he derived Avogadro's law only three years later than Avogadro.

Because of his high mathematical attainments, he became a pioneer in the application of mathematical analysis to molecular physics. His research interests also include botany, optics, psychology, ethics, philosophy, and scientific taxonomy. He wrote the Analytical Notes on the Natural Classification of Human Knowledge (1834-1843), a comprehensive work on the knowledge of various subjects.

His main scientific work was in electromagnetism. In 1820, Oster brought back to Paris the news of Oster's discovery of the magnetic effect of electric current, and he reacted quickly, and in just over a month, he submitted three articles** to report the results of his experimental research: energized solenoids are similar to magnets; There is an interaction between two parallel long direct current-carrying wires.

He then used experiments to prove that in the earth's magnetic field, energized solenoids are oriented like small magnetic needles. A series of experimental results provided him with a major clue: the magnetism of the magnet is generated by a closed current.

At first, he thought that there was a large toroidal current in the magnet, but later he was reminded by his friend Fresnel that macroscopic circular currents cause heating in the magnet and proposed the molecular current hypothesis. He tried to refer to the methods of Newtonian mechanics to deal with the problem of electromagnetism. He believed that in electromagnetism, the corresponding point of the particle is the current element, so the fundamental problem is to find out the interaction force between the current elements.

To this end, from October 1820 onwards, he devoted himself to the study of the interaction between electric currents, during which time he showed his great experimental skills. Based on four typical experiments, he finally came up with a formula for the force between the two current elements. He called his theory "electrodynamics".

Ampère's main work on electromagnetism is The Mathematical Theory of Electrodynamic Phenomena, which is one of the important classics of electromagnetism.

In addition, he proposed that adding a soft iron core to the solenoid can enhance the magnetic properties. In 1820, he first proposed the use of electromagnetism, the phenomenon to transmit telegraph signals.

The unit of current intensity, named after his surname ampere, is one of the basic units of the International System of Units.

Many of the definitions of basic units have changed.

I think the original definition of seconds was 24 hours a day, 3600 seconds an hour. However, the speed of the Earth's rotation changes, so the above definition was later changed.

The same is true for kilograms, which were originally defined as 1 kilogram of pure water at 4 hours 1 dm 3.

Temperature is defined as 0 for ice-water mixture and 100 for water boiling at one atmosphere.

For ampere, I think that the original definition was coulomb, the amount of electricity of an electron (I remember it was introduced in junior high school physics, 1982), a = 1c s. Later, it was changed to define ampere first, and then coulomb, so there is a very strange definition of ampere. 1c=1a×1s。

According to the new definition, 1 coulomb is about the amount of electricity of an electron.

The definition of electric current is like this:

If two parallel and infinitely long straight wires pass through a current of the same magnitude direction, so that when they are 1m apart, there is an interaction force of 1n per unit length, then the magnitude of the current is defined as 1a, understand?

It's a strange definition, but that's how it is.

The unit of electric current, he is a scientist.

Ampere meaning:International System of Unitsindicates the currentBase unit, abbreviated as Ann, symbol A. In memory of the French physicist A

Ampere was named after him, and he made the famous one in 1820Ampere's Law

In 1908, at the International Congress of Electricity Demolition held in London, a constant current that can electrolyze milligrams of silver from a silver nitrate solution in a 1-second interval was defined as 1 ampere, also known as the international ampere.

Ampere History

Ampere was originally defined as the centimeter gram second system in which the unit of electricity is one-tenth of an absolute ampere. It is so sized to ensure that the ampere values derived from other units in the SI system are appropriate.

The "international ampere" is an older unit of electric current, defined as the current that causes the precipitation of silver in a solution of silver nitrate per second. Later, it was found that this current was.

French physicist. Founder of electromagnetism 2The SI unit of current intensity, i.e., one coulomb of electricity per second passing through the cross-section of a conductor, is one ampere – abbreviated as "ampere".

Ampere is the basic unit of electric current in the International System of Units, referred to as ampere, symbol a. In memory of the French physicist AAmpere, who proposed the famous Ampere's law in 1820.

In 1881, the First International Congress of Electricity, held in Paris, decided to name the unit of current in amperes.

Ampere is the basic unit of electric current in the International System of Units, abbreviated as ampere. Symbol A.

Ampere is the basic unit of electric current in the International System of Units, referred to as ampere, symbol a.

Ampere's most important achievement was the study of the role of electromagnetism in 1820 and 1827, and he was hailed by Maxwell as "the Newton of electricity". He has made outstanding achievements in the field of electromagnetic interaction. The SI unit of electric current, the ampere, is named after his surname.

A constant current passes through two parallel straight wires of infinite length and negligible circular cross-section in a vacuum of 1 metre, and when the force generated between the two conductors per metre of length is equal to 2 10 7 Newtons, the current passing through the wire is specified as one amperere. This unit was approved by the International Committee for Weights and Measures in 1946 and officially adopted as one of the basic units of the International System of Units at the 11th International Conference on Weights and Measures in 1960.

Currents smaller than amps can be expressed in milliamps, microamps, etc.

1 amp = 1000 mA.

1 mA = 1000 mA.

The conversion relationship between amps and other units of current is as follows: 1 ampere is equivalent to 3 109 CGS electrostatic current units (ESU). 1 ampere is equivalent to an electromagnetic current unit (EMU).

Amps are a unit of electric current.

The conversion relationship between amperes and other units of current is:

1 ampere is equivalent to 3 10cgs electrostatic current unit.

1 ampere is equivalent to a unit of electromagnetic-based current.

With NMR, it is possible to measure absolute measurement amperes. Less than amperes can be used in milliamps.

MA), micro-ampere (A) and other units.

Ampere's explanation.

1) [ampère, andrē, marie] 1775-1836) French physicist. Founder of Electromagnetism (2) [ampere] The unit of current intensity in the International System of Units, i.e., when the amount of electricity passing through the cross-section of a conductor per second is one coulomb, its current intensity is one ampere – abbreviated as "ampere" Explain in detail the unit of current intensity. When the amount of electricity passing through a conductor per second is one coulomb, the current intensity is one amperere.

The name was chosen in honor of the French physicist Andréampère. Abbreviated as "Ann".

The word decomposition of the word 安 is explained 安 ā calm , stable : to be stable. Peace.

Peacefulness. Safe. Leisure.

Settle down. Settle the country. Make it calm, make it calm and touch the suspicion (mostly refers to the mood):

An Min . Console. Appease.

Feeling satisfied with life and work: peace of mind. An Zhi Ruosu (in the event of an unsatisfactory situation or abnormal phenomenon, treat the cultivation as usual, the explanation of the cultivation é to protect the plant or the embankment, etc., add soil to the foundation part:

Earth up. Cultivation (恘). Training.

Cultivate. Helping and protecting human growth: nurturing.

Cultivate. Training. Radical : Earth.