As you already know, that not all of the conductive material has a conductivity of the same level, to the movement of electrons. At a particular material, the conductivity can be very low, so that the movement of the electron mobility became an extremely difficult case, even the movement of the electron mobility of certain materials did not last. For example insulators, window glass is better than in most plastics, and better than fiberglass.
As well as electrical conductors, some are better than others. For example, silver is the best conductor in group of conductors, the material gives a more convenient space for the electrons to move in comparison to the other conductor. Other materials such as glass, glass electrons have little room to move freely. When the external force such as a physical tug imposed on these materials, the free electrons are forced to leave the atom and move to other atoms of the material.
But the electrons can not move easily between atoms in the material. Electrical insulators are materials that can not or difficult to transfer electrical charge. In the insulating material tightly bound valence electrons in atoms. These materials are commonly used in electrical equipment and elektronikauntuk reasons of security and prevention against the danger of electric shock.
Isolator is also used as a load-bearing or separator between the conductor without making the current to flow to the outside or between conductors. Some materials, such as glass, paper, or Teflon is a very good insulator. Some synthetic materials are still “good enough” is used as a cable insulator. Examples of plastic or rubber. The materials have been selected as the cable insulator because it is more easily formed / processed while still being able to block the flow of electricity on medium voltage (hundreds, perhaps thousands of volts).
Insulators or non-conductors are materials that have electrical resistance values or inhibition of electricity is very high, so that the electric current can not flow through it. Because of its nature that does not conduct electric current, the material is widely used as a protection against the danger of electric shock. An insulating material that is often used is glass, mica, porcelain, rubber, transformer oil and varnish.
Insulation resistance value in ohms, typically ranging from:
10 × 10 9 = 10.000.000.000 Ω, up to 10 × 10 15 Ω = 10.000.000.000.000.000.
Attributes Isolator
Insulators or insulating material is used to separate the parts that voltage. For the use of insulating material necessary to consider the nature kelistrikanya. In addition, it is also necessary to consider the thermal properties, mechanical properties and chemical properties. Electrical properties include resistivity, permittivity and dielectric loss. Insulators or insulating material has a resistivity requires a large order that leak current as small as possible (can be ignored).
Noteworthy here is that the hygroscopic insulation materials should be considered its use in places that are damp because the resistivity will drop. Resistivity will decrease if the applied voltage rises.