Does electricity have density? What is the charge density

Why does electricity have no density?

The usual definition of density is the amount of mass of the substance contained in a unit volume, then electricity has no density because electricity has no mass.

However, if the density of electricity is defined as the amount of charge contained in a unit volume, then it is also possible, some objects are more charged, and some objects are less charged, so it can be expressed by electricity density. As a divergent thinking, this method is very good.

Yes. But the range is too broad, it's hard to say, the current is composed of electrons, check the volume and mass of the electrons can be obtained, but the density of the current should be related to the density of the electrons that live there, then the degree of electron colonization should be different, so just say the density of electricity, I think it should not be a fixed value, check it yourself.

Electricity is not a substance, so there is no density, I appreciate the landlord, there is a desire for knowledge, compared to those who ask for **, find a girlfriend, malicious irrigation is much better.

Electricity is a way of storing energy, and it cannot be said that there is or does not have density. The electric field excited by electricity is a substance, and the term electric field density is actually a description of the strength of the electric field.

That's a strange question.

The answer is that electricity has no density.

5th floor, the current is generated by the directional motion of electrons, not by electrons, and while that's wrong, it's good that you're not fixed.

I don't quite understand what kind of physical phenomenon you are referring to. Current? Electric charge? Electric field? Potential? Electromagnetic action?

Assuming that the charge is distributed in a curve or a straight rod, the line charge density is the charge density per unit length in coulomb meters. The surface distribution of the charge is measured by the charge body density, which is distributed on the surface of the object, and its surface charge density is the charge density per unit area in coulomb meters2.

The charge distributed in bulk is measured in terms of the bulk density of charge, which is distributed in a region or inside an object in a three-dimensional space, and its bulk charge density is the amount of charge per unit volume in coulomb meters 3.

Electricity is made up of charged particles, and charged particles have density, and electricity naturally has density. But positive and negative charges can be combined, so the electric density (or charge density) is not the same as the particle density. And, due to the mobility of electrons (conductivity or electrical induction), the charges are often unevenly distributed in matter.

For example, in metals, electric charges are always distributed on the surface. Hence the concept of what is the charge density is rarely mentioned. In general, bulk charge density is in units of coulomb cm3 light is composed of photons and is obviously density.

Charge density concept.

Charge density is a measure used in electromagnetics to describe how dense a charge distribution is. The divergence of the electric field strength is equal to the charge body density divided by the dielectric constant, so the charge density is equal to the electric field strength multiplied by the dielectric constant, so the relationship between the charge density and the electric field strength is that the greater the electric field strength, the greater the charge density. It can be classified as line charge density, surface charge density, bulk charge density.

When the solid is charged, the charge is distributed on the surface, and the surface charge density at the solid is large. The charge of the flowing liquid is mixed with the liquid. The charged condition of the powder changes randomly with the dispersion, suspension and deposition of the powder.

Gas charging is the charging of powdery particles (such as moisture, impurities) suspended in the gas. Since there are two types of electric charges in nature, positive and negative, the charge density can be negative. The charge density may also depend on the location.

Charge density is not the same concept as charge carrier density. Charge carriers are freely moving charged particles, such as electrons in metals, ions in solution, and holes left by covalent bonds due to electron loss in semiconductors. The charge carrier density is the carrier per unit volume.

Specific gravity: grams of cubic centimeters.

Phenolic resin is a synthetic plastic, colorless or yellow-brown transparent solid, also commonly known as bakelite because of the use of electrical equipment.

It has excellent heat resistance, flame resistance, water resistance and insulation, good acid resistance, poor alkali resistance, good mechanical and electrical properties, easy to cut, and is divided into two categories: thermosetting plastics and thermoplastics. Modified phenolic resins with different functions can be obtained by adding different components during synthesis, with different excellent characteristics, such as alkali resistance, wear resistance, oil resistance, corrosion resistance, etc.

There are two main production methods. One causes phenol and formaldehyde to react directly to produce a thermoset network polymer, while the other limits formaldehyde to produce a prepolymer called phenolic varnish that can be molded and then cured by adding more formaldehyde and heat. There are many variations in the production and input materials used to produce a variety of special-purpose resins.

Bakelite has been widely used in many places in our lives, such as: bakelite sockets, bakelite switches, bakelite spoon handles, bakelite gourd wire, bakelite records, bakelite handwheels, handles, handles, handles, paper towel boxes, kitchen stove counters, bakelite tea trays, billiard balls and so on.

Molding properties. 1. The formability is better, but the shrinkage and directionality are generally larger than those of amino plastics, and contain water volatiles. Before molding, the barrier should be preheated, and the molding process should be exhausted, and the mold temperature and molding pressure should be increased if it is not preheated.

2. The mold temperature has a great impact on the fluidity, and the fluidity will decline rapidly when it exceeds 160 degrees.

3. The hardening speed is generally slower than that of amino plastics, and the heat released during hardening is larger. The internal temperature of large thick-walled plastic parts is prone to too high, and it is easy to harden unevenly and overheat.

A physical quantity that describes the strength of the current and the direction of flow at a point in a circuit. It is a vector [1], whose magnitude is equal to the amount of electricity passing through a unit area per unit time, and the direction vector is the normal vector of the corresponding section per unit area, and the direction is determined by the direction of the positive charge passing through this section. In order to describe the current situation at each point in the wire, it is necessary to introduce a vector field, the current density j, in order to describe the current situation at each point.

The direction of j at each point is defined as the direction of positive charge motion at that point, and the magnitude of j is defined as the current per unit area that crosses the point and is perpendicular to j.

Current density is important in the design of power and electronic systems. The performance of a circuit is closely related to the amount of current, which in turn is determined by the size of the object of the conductor. For example, as integrated circuits become smaller in size, the current density tends to increase in order to achieve the goal of increasing the density of the number of components contained in the chip, even though the smaller components require less current.

For more details, see Moore's Law.

In the high-frequency domain, the conduction region is more confined to the vicinity of the surface due to the skin effect, resulting in an increase in current density.

Too high a current density can have undesirable consequences. The resistance of most electrical conductors is a finite positive value that dissipates power in the form of thermal energy. In order to avoid melting or burning of electrical conductors due to overheating, and to prevent damage to the insulation, the current density must be kept below too high a value.

If the current density is too high, the interconnections between materials will begin to move, a phenomenon known as electromigration. In superconductors, too high a current density generates a strong magnetic field, which causes the superconductor to spontaneously lose its superconducting properties.

The analysis and observation of current density can be used to probe the intrinsic physical properties of solids, including metals, semiconductors, insulators, and more. In this field of science, materials scientists have developed a very detailed set of theoretical formalisms to explain many of the important experimental observations [2].

Ampere's law describes the relationship between current density and magnetic field. Current density is an important parameter of the law of amperine force [2], in transformer design, different core size, different temperature rise, different voltage drop requirements, different heat dissipation conditions, current density will be different, it cannot be considered that how much wire diameter allows how much current density is a fixed value, the relationship between current intensity and current density.

Current density is a measure that is defined in the form of a vector whose direction is the normal vector of the corresponding section per unit area, and its magnitude is the current per unit section area. Using the International System of Units, the unit of current density is ampere square meters