The flow of electrons moving in an electrical conductor with a certain velocity called the electric current (I). The emergence of electric current because there is a potential difference at two ends of a conductor. While the potential difference in the two conductor due to one end of the conductor to get a force that drives the electrons to move.

Electric current will only occur in a closed circuit. Unit to measure the electric current is called the Ampere or abbreviated with the letter A. One coulomb charge of an electron moving through a conductor of a circuit in one second is called an Ampere. The relationship between electrical current (I), the amount of electron charge (Q), and the unit time (t) is written with the formula

- I is the electric current (in Ampere)
- Q is the electron charge (in units of coulombs)
- T is time (in seconds)

Sample questions:
What is the size of an electric current that flows when the number of electrons of 60 coulombs in a closed circuit for half a minute?


electric currents flowing at 2 Amperes.


Atom consists of nucleus and electrons orbiting the nucleus. The core itself consists of positively charged protons and uncharged neutrons. The electrons surrounding the nucleus are negatively charged. Large load equal protons and electrons, ie e = 1.6 x 10-19 coulombs.

Semiconductor materials most widely used in the manufacture of electronic devices is the silicon (Si). The atom consists of nucleus and 14 electrons orbiting the nucleus. Essentially consists of 14 protons and 14 neutrons. 14 electrons orbiting the nucleus is divided into 3 groups. Group closest to the core consists of 2 electrons, the group furthest from the core consists of 4 electrons, while the third group of 8 electrons located between the two groups.

Each group also called atomic skin. So The skin has 3 atoms that contain electrons. Electrons located in the outermost shell are called valence electrons. Energy electrons in the skin closest to the core is the largest. Power is due to the attraction between positive charges in the nucleus with the negative charge of electrons.

Power is on the outer shell is the smallest, therefore the electrons are most easily separated from the core. If despite these electrons then move freely, so-called free electrons. The number of free electrons in a substance determines the nature of electricity. Movement or the movement of free electrons has resulted in the emergence of electrical energy.

When such a large amount of iron or metal, then a good electrical conductivity. This substance is then known as the conductor material. And if the number of free electrons in such a timber, then the substance is difficult to conduct electricity or insulating materials known.

The number of free electrons in a substance such as silicon (Si) and Germanium (Ge) is not as much as in metals but not the least in the insulation, the electrical conductivity of metal was not as good but better than insulators. Such substances are called semi-conductor materials.


Basically, electrons are in each object, whether solid, liquid or gas. Here are outlined the position of electrons in the composition of an object.

  • Object is something that can be touched or seen with the naked eye.
  • Molecular is the smallest of things can still be divided again and still contains the chemical elements of the object.
  • Atom derived from the word which means not atomos indivisible, the smallest part of an object that can not be divided again. But after he was found redioktivitet symptoms, assuming it can not be maintained.Atom consists of electrons and atomic nuclei.

Based on the nature of the electron, it is divided into 3 categories:
  1. Conductor: is it easy to conduct the electrical charge, for example iron and copper
  2. Insulators: an object that is difficult to conduct electrical charges, for example plastic and wood
  3. Semi-conductor: an object load electric conductivity is not as good but better conductor than an insulator, such as transistors and diodes


Electronics is the study of the properties and use of the principle of work is the flow of electrons in a vacuum or gas (as in radio tubes) and the flow of electrons in a semi-conductor (such as in transistors).

Electronics include radio, radar, television, the industry regulatory system, computer, voice recording, measuring instruments, medical tools, mobile phones and devices that use radio tubes or semi-conductor devices.


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Kang CaangMy name Zaldi Hardiyanto
Born in Bandung, West Java, Indonesia in 1981

I know the world of electronics since junior high school, then entered a vocational high school in the electronics department STMN 2 Bandung. Graduated from there and accepted the work as Electrical Technician at a private company in the city of Bogor. Two years later I went to college in UIKA Bogor majoring in electrical engineering and graduated in 2008.

My friends call me with Caang, (words in Sunda) which means light.

If you wish to contact me, send email to zaldi_ca@yahoo.co.id
or via SMS to 08121070518
:senyum: :jempol:

Best regards


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