Whether the insulator is not conductive or extremely resistant

The resistance is extremely high. At this time, the current is very small, almost as if it does not exist.

Compared to conductors, insulators have a higher resistance and less current when the same voltage is applied.

Substances that are not good at conducting electric current are called insulators, which are also called dielectrics [1]. They have extremely high resistivity. Definition of insulator: An object that does not easily conduct electricity is called an insulator.

There are many types of insulators, such as plastics, rubber, glass, ceramics, etc.; Liquid such as various natural mineral oils, silicone oils, trichlorobiphenyls, etc.; Gases such as air, carbon dioxide, sulfur hexafluoride and so on. In general, gases are good insulators.

Under the influence of certain external conditions, such as heating and high voltage, the insulator will be "broken down" and converted into a conductor. An insulator is also not an absolutely non-conductive object until it is broken down. If a voltage is applied at both ends of the insulating material, a weak current will appear in the material.

There are usually only trace amounts of free electrons in insulating materials, and the charged particles that participate in conduction before being broken down are mainly intrinsic ions and impurity particles dissociated by thermal motion. The electrical properties of insulators are reflected in processes such as conductance, polarization, loss, and breakdown.

An insulator is a substance that can block the flow of heat (thermal insulator) or charge (electrical insulator). The opposite of electrical insulators are conductors and semiconductors, which allow the flow of electric charge (note: strictly speaking, a semiconductor is also an insulator because at low temperatures it blocks the flow of electric charge unless other atoms are doped in the semiconductor, which can release excess charge to carry the current).

The term electrical insulator has the same meaning as dielectric, but the two terms are used in different fields.

A thermal insulator in the full sense of the word cannot exist according to the second law of thermodynamics. However, there are some materials, such as silica, that are very close to true electrical insulators, giving rise to flash memory technology. A larger category of materials, such as rubber and a lot of plastics, are used for home and office wiring"Perfect", there are no safety concerns, and it is also very efficient.

Before the invention of better synthetic (physical or chemical) substances, mica and asbestos can be good thermal and electrical insulators in nature's intrinsic substances.

Insulators do not conduct electricity easily because there is almost no charge in the insulator that is able to move freely.

1. There is no complete insulator, because even the insulator contains a small number of flowing charges (charge carriers) that can carry current. In electrical installations, conductors are supported and isolated without passing an electric current through themselves. At the same time, the insulating materials that are widely used in wires and other equipment are called insulating materials.

<>2. What is an insulator? Gases such as air, carbon dioxide, sulfur hexafluoride and others are gas insulators. Solid insulating materials such as plastic, rubber, glass, etc.

Liquid insulation materials include: all kinds of mineral oil, silicone oil, trichlorobiphenyl, etc. But they can also become conductive under certain circumstances.

The reason why insulators do not conduct electricity easily is that there is no free-moving charge inside the insulator

An insulator is a substance that does not normally conduct electric current. Also known as dielectric. Insulators are characterized by the tight binding of positive and negative charges in the molecule, and very few charged particles that can move freely.

The reason why a conductor can conduct electricity is that there is a large number of freely moving charges inside the conductor.

The resistivity of an insulator is very large, so in general, it is possible to ignore the macroscopic current formed by the movement of free charges under the action of an external electric field, and consider it to be a non-conductive substance.

Insulators can be divided into three categories: gaseous such as hydrogen, oxygen, nitrogen and all gases in a non-ionized state, liquid such as pure water, oil, paint and organic acids, and solid such as glass, ceramics, rubber, paper, quartz, etc. Solid insulators are further divided into two types: crystalline and amorphous. The actual insulator is not completely non-conductive, and under the action of a strong electric field, the positive and negative charges inside the insulator will break free and become free charges.

An insulator is a substance that is not good at conducting electricity or heat. In electricity, an insulator is also known as a dielectric, and it has an extremely high resistivity. Whether solid or liquid, if there are electrons or ions inside it that can move freely, it can conduct electricity.

There is no free-moving charge, and under certain conditions, conductive particles can be produced, so an insulator can also become a conductor.

Therefore, there is no absolute boundary between insulators and conductors. Insulators and conductors are convertible under certain conditions. Nowadays, insulators have been widely used in cable surfaces, electronic systems, microelectronic components and other fields.

No. The definition of an insulator is that an object that does not easily conduct electricity is called an insulator. Under certain conditions, it can be converted into a conductor.

1. The outer surface is stained with a layer of water, and impure water leads to conduction.

2. The voltage is too large, and the insulator will break down.

3. Physical damage, so that the circuit on both sides of the insulator is in contact, of course, this does not belong to the insulator itself conductive.

For insulators, there is always a breakdown voltage that gives enough energy to the valence band electrons to excite them to the conduction band. Once the breakdown voltage is exceeded, the material is no longer insulating. However, breakdown is often accompanied by a physical or chemical change that destroys the material's insulation.

Insulators are all subject to electrical breakdown. When the applied electric field exceeds a certain threshold, which is proportional to the width of the material's bandgap, the insulator will suddenly transform into a conductor, with potentially catastrophic consequences.

During the electrical breakdown, the free electrons are accelerated to a high enough velocity by a strong electric field that collides with the bound electrons to free the bound electrons from the atom (ionization). The new free electrons can be accelerated and hit other atoms, producing more free electrons, forming a chain reaction.

Soon the insulator will be filled with movable carriers, so its resistance will drop to a very low level. In air, a corona discharge is a normal electric current in the vicinity of a high-voltage conductor; Arcing is an abnormal, undesirable current.

Similarly, breakdown can occur in any insulator, even in a solid. Even vacuum has some form of breakdown, but this breakdown, or vacuum arcing, is related to the emission of electrons from the electrode surface, not by the vacuum itself.

Extended Materials. Insulators are usually used as the outer cladding of cables. In fact, air is an insulator in its own right, and no other substances are needed to insulate it.

High-voltage power lines are insulated by air, as it is not practical to use solid (e.g. plastic) cladding. However, wires touching each other can cause short circuits and fires.

In coaxial cables, the conductor in the center must be in the center to prevent the reflection of electromagnetic waves. In addition, any voltage above 60V can cause a risk of electric shock or electric shock to the human body. The use of insulators as exterior cladding can prevent these problems.

In electronic systems, printed circuit boards are typically made of epoxy plastic and fiberglass, and a non-conductive substrate supports the copper wire layer. In electronic devices, tiny and delicate active parts are embedded in non-conductive epoxy, phenolic, glass or ceramic coatings.

In microelectronic components such as transistors and integrated circuits, the doped silicon material is usually a conductor. But by heating in an oxygen environment, silicon can also be easily transformed into an insulator. Silicon is oxidized to give quartz, also known as silica.

In high-voltage systems with transformers and capacitors, liquid insulated motor oil is often used to prevent arcing from occurring. In places where it is necessary to withstand a fairly high voltage without being electrocuted by electricity, people insulate with oil instead of air. Other insulation methods include the use of ceramic, glass, vacuum, etc., or the use of air when the wires are far apart.

Insulators do not conduct electricity, but not in all cases. Insulators are not easy to conduct electricity, and insulators can also become conductors under certain conditions, such as high temperature, high voltage, etc., some insulators will become conductors and conduct electricity. For example, glass is an insulator at room temperature, but it can conduct electricity when burned to a red-hot state.

Therefore insulators do not conduct electricity, not in all cases.

Insulators may become conductors in special circumstances, such as when heated, so it is not the case that insulators do not conduct electricity.

No. When the external voltage reaches a certain level, the insulator can be broken down, so that the insulator has free moving electrons, and the insulator conducts electricity.

The reason why insulators do not conduct electricity easily because there is almost no charge in the insulator that is able to move freely.

Substances that are not good at conducting electric current are called insulators, and insulators are also called dielectrics. They have extremely high resistivity. Definition of Insulator:

Objects that do not easily conduct electricity are called insulators. Insulators and conductors, there are no absolute boundaries. Insulators can be converted into conductors under certain conditions.

It should be noted here that the reason for conducting electricity: whether it is a solid or a liquid, if there are electrons or ions in it that can move freely, then it can conduct electricity.

There is no free-moving charge, and under certain conditions, conductive particles can be produced, then it can also become a conductor.

Question 1: Why can conductors conduct electricity? Why Insulators Don't Conduct Electricity Conductors are able to conduct electricity because the molecular structure inside the conductor has electrons that can move freely and these electrons move along the electric field lines so that an electric current can be formed.

In the molecular structure inside the insulator, the electrons are bound and cannot move freely, so the current cannot be formedQuestion 2: Can the insulator be electrified? Insulators do not conduct electricity? Insulators can be electrified, but these electrons cannot move, so they do not conduct electricity and cannot form an electric current.

Question 3: Why do conductors conduct electricity while insulators cannot? 5 The teacher taught in physics that metals can conduct electricity because they have free electrons, while insulators, especially rubber, have a strong ability to bind electrons, so they cannot conduct electricity.

But glass is also an insulator, but its ability to bind electrons is weak. Can anyone explain the system for me? Added:

Our teacher said that insulators have a strong ability to bind electrons, so they are insulated, but why is glass insulated and has a weak ability to bind electrons? Satisfactory answerstabber2008-12-15Under the action of the electric field, the electrons or ions inside the conductor will move directionally and form an electric current. Most metals are conducted by free electrons, and salty aqueous solutions of salts or salts will be ionized in electric water to form free-moving ions, and will also produce directional movement under the action of the electric field, which has strong conductivity.

The main component of glass is SiO2, the structure of this substance is, O:::Si:::O, 6 electrons around each oxygen atom and 2 electrons of silicon atoms open into a common electron pair, this structure is very stable, it cannot be destroyed in a small energy, electrons can not move freely, so it cannot conduct electricity.

The silicon element has a certain conductivity, because there are holes between the atoms of the silicon element, and the electrons and holes will replace each other, and there is a certain conductivity, but it cannot be said that in the silicon atom, the proton has a small ability to bind the electron, which is a case-by-case matter! Testimonials from dreams: I basically understand.

It's not bad to have a cold dream. Thanks too! 2008-12-16Other (4) A ray of sunshine level 5 2008-12-15Electricity conduction is by free electrons, current is the movement of electrons, there are experiments in physics books.

Gargamel Level 3 2008-12-15 The strength of the ability to bind electrons is relative, we say that the strong ability of insulators to bind electrons is that the insulator has a strong binding ability relative to conductors, in fact, conductors also have the ability to bind, but it is very weak; The weak ability of glass to bind electrons means that in insulators, the ability of glass to bind electrons is weak. These things are relative and not absoluteQuietly and sincerely look at the pseudo-moxibustion eggplant?

Stool pretty? Four snatches.

Under general conditions, insulators are non-conductive. It's not clear when it's special.

Such as: wet wood; Heating glass.

Because there is almost no charge in the insulator that is able to move freely. An insulator is a substance that does not normally conduct electric current. Also known as dielectric.

The characteristic of insulators is that the positive and negative charges in the mold-opening molecule are tightly bound, there are very few charged particles that can move freely, and their resistivity is very large, so in general, the macroscopic current formed by the free charge movement under the action of the external electric field can be ignored, and it is considered to be a non-conductive substance.

Insulators can be divided into three categories: gaseous such as hydrogen, oxygen, nitrogen and all gases in a non-ionized state, liquid such as pure water, oil, paint and organic acids, and solid such as glass, ceramics, rubber, paper, quartz, etc.

Solid insulators are further divided into two types: crystalline and amorphous. The actual insulator is not completely non-conductive, under the action of a strong electric field, the positive and negative charges inside the insulator will break free from the bondage and become free charges, and the insulation properties will be destroyed, this phenomenon is called dielectric breakdown.

The maximum electric field strength that a dielectric material can withstand is called the breakdown field strength. In an insulator, a bound charge is placed under the action of an external electric field, which will be microscopically displaced, resulting in a polarized charge, which is the so-called polarization of the dielectric.

Dielectrics can be divided into two types: isotropic dielectrics and anisotropic dielectrics according to their physical properties. In terms of polarization mechanism, it can be divided into two types: apolar molecule and polar molecule. Insulators are widely used in engineering as electrical insulating materials, dielectric for capacitors and special dielectric devices such as piezoelectric crystals.