Electrotechnics: Basics


Electric current in liquids and melts

Electric current in liquids and melts

Conduction current that exists in metals, where the free charge carriers are electrons, and the current in the liquids and melts, characterized in effects produced. Of course, have a lot in common, first of all - is the flow of electricity dq/dt is not equal to zero, i.e. in the cross section perpendicular to the direction of electric current changes the amount of charge. Also, the electric current is accompanied by the release of energy in the form of heat radiation and magnetic phenomena. Of the differences can be distinguished primarily electrochemical conversion substance, and in most cases no ability shielded from external electromagnetic fields. The electrolytes used in chemical power sources, such as galvanic cells and batteries. In production processes electroplating and electrochemistry, electrolytes are also used and are using electrochemical processes running during the flow of electricity through the fluid.

Electric current of conduction

Electric current of conduction

As in everyday life, we hear the expression of an electric current, it is primarily meant by this is the conduction current. This is just one of the types of currents for the environment, called conductors. The nature of current conduction due to the property of a substance called - conductors. Let's see that such conductors as they exist in the electric current and which at the same phenomena occur. Let's start with the fact that the electric current is the flow of electricity, so is the flow of charges, which are the most electricity in the quantitative measurement in the Coulomb (C).

Mechanisms conduction electrical current in various media

Mechanisms conduction electrical current in various media

Where there may be free charge carriers, where possible electric current. An elementary particle - an electron has a negative charge on the sign, this particle is so small that it is able to penetrate anywhere. In addition to her, there are other particles, such as photons. You can safely say that the existence of electrical current may everywhere. We live in a world of electric currents and magnetic phenomena. In physics are distinguished substance and vacuum, that is such a part of the space in which there is no substance, but may be present subatomic particles such as electrons or photons, that can react to electromagnetic fields.

What is electrical current?

What is electrical current?

In electrical circuits, current is created mostly by moving the free charges in the conductor. Electric current can also exist in fluids where the free charge carriers are ions. These fluids are electrolytes and molten substances. The current in the plasma is carried out both ions and electrons. Besides possible current transfer, e.g., in vacuo, and the current in the semiconductors. The SI unit of electric current the ampere (A). Denoted by the Latin letter I. This value characterizes the rate of change of the charge in the section of the measured flow. One ampere of current - this is such a value at which the one second time the flow passes through a section of the quantity of electricity to one Coulomb (C).



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