# Electronic Devices - Semiconductors - Discussion

Discussion Forum : Semiconductors - General Questions (Q.No. 11)
11.
Which statement best describes an insulator?
A material with many free electrons.
A material doped to have some free electrons.
A material with few free electrons.
No description fits.
Explanation:
No answer description is available. Let's discuss.
Discussion:
19 comments Page 1 of 2.

John donkor said:   8 years ago
The conductivity of any material is inversely proportional its resistivity. An insulator like nylon, polyethylene and wood have some degree of conductivity. Conductors have different conductivity so some can be comparably insulators. Nylon and polyethylene can be made to transfer electrons by rubbing against with a special rod. Once the electrons are able to move a small amount of current is recorded which differs from materials hence conduction occurs.

We can not say that all materials have the same electron, conduction and depletion layer hence the difference.

Generally the conductivity is completely depends on the concentration of the free electrons so insulator has no free electrons. And also the carbon material that is diamond is a insulator because of it has a strongly bonded with neighbourhood four electrons so it has no free electrons in diamond. So this is the one of the example for the insulator.

I will support naveen statement.
Every insulator is a conductor. For example, for Conductors Energy gap Eg <0.5 , for semiconductors Eg=1.00 for Insulators Eg is too large .If you give the potential value > Eg value for insulator then it acts as conductor.

So option C is correct.

Magma said:   7 years ago
Insulators are not meant to have free electrons. Free electrons leads to conductivity whether in small amounts or big. That's why some conductors are more effective than others. So there is no reason for a n insulator to have free electrons since it does not conduct electricity.

Narendra kumar k said:   1 decade ago
Due to the presence of free electrons conduction takes place. Since insulator is a material which does not conduct electricity, we can conclude that, insulator doesn't have free electrons or it has very few free electrons.

Sandeep kumar said:   4 years ago
Answer D is correct, In insulator, the energy gap is very large approx 5ev. Electrons can't jump from valence band to conduction band so conduction band is completely empty. If temp increase the device will same.
(1)

If the number valance electron in an atom for conductor 1/2/3/that material is called as conductor since semiconductor 4 insulator 5/6/7/ thjat material is called as insulator.

Dirisala said:   7 years ago
The flow of the electrons is called as current. If there is very less amount of the electrons the current flow will be decreased to low or zero.

There are very few free electrons in an insulator, because valence electrons are tightly bound to the atoms.

Ex: wood, glass, and diamond.

Sri said:   1 year ago
Conductor have large free electrons.

Semiconductor have few free electrons.

Insulators have no free electrons.