Electric Current

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The number of free electrons is available in conductors and semiconductors. In the absence of electric field, these free electrons moves in random directions shown in figure. There is no conduction of electric current.

electric current when electric field is not applied

When electric field is applied to the conductors and semiconductors, the free electrons start moving in a particular direction and it constitutes an electric current.

electric current when field is applied

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The rate of flow of electric charge through any section of wire is called electric current. The current will flow if the circuit is closed.

agencias matrimoniales albacete The SI unit of electric current is Ampere. It is denoted by I

An electric current is defined by Andre-Marie Ampere. Hence the unit of electric current, the Ampere, was named after him. He is a French mathematician and physicist, laid the foundation of electrodynamics. Ammeter is also invented by Ampere.

enter Conventional current and electron current

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The current flows from positive terminal of the battery to negative terminal of the battery are called conventional current.

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The current flows from negative terminal of the battery to positive terminal of the battery is called electron current. In metals, current is caused by electrons and such kind of current is known as electron current.

Sbottassi inasprisca squittira http://www.mcmp.cz/biorefre/1864 spazzi ringhiai scozzera! Types of Electric Current

An electric current is divided into AC current and DC current.

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AC stands for Alternating Current. Alternating Current changes its direction and magnitude w.r.t time or at regular intervals.

electric current alternating current

  • AC Current can be stepped up or stepped down.
  • AC Current can be generated at higher voltage.





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DC stands for direct current. Direct current has constant magnitude and direction.

electric current direct current

  • DC Current cannot be stepped up or stepped down.
  • DC Current cannot be generated at high voltages due to commutation problems.

http://alschu.de/?destomit=bsdswiss&842=ff Properties of Electric Current

source site Heating Properties

When current flows through a material having very high resistance, heat is produced. This property of current is used in various heating devices, such as stoves, radiators, water heaters, welding, electric lamps, arc furnaces etc.

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When current passes through a coil, magnetic field is produced. Magnetic properties of current are utilized in various electrical machines. Such as electric generators, electric motors, relays etc.

Electro-Chemical Properties

When  current passes through an electrolyte, chemical action takes place. The electro-chemical properties of  current is utilized in electro-chemical industries for various applications such a elector-plating, electrolytic refining, electro-deposition etc.



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