Field strength, electric potential, electric potential energy, what are they referring to?

The field strength indicates the magnitude of the electric field strength at that point.

Gravitational potential energy and point potential energy also have the same place. Mass * (acceleration due to gravity * height) = gravitational potential energy of the object. Charged * (electric potential) = electric potential energy of the object. The height is relative to the height, and similarly, the electric potential is also relative.

High school physics books on it.

Detailed. In simple terms.

Answer!

An important concept in the study of physics is to develop a deep understanding of the word "field". Gravitational fields, electric fields, magnetic fields, and many more. The environment we live in is also an environment where many "fields" are superimposed.

As for the electric field, it should be understood in contrast to the gravitational field. The gravitational field is familiar to us: there is a gravitational field around the Earth, and objects with mass are subjected to gravity in it. Similarly, a charged object experiences an electric field force in an electric field.

The field strength indicates the strength of the electric field at the point, for example, if the electric field force of the same charge at point A is greater than the electric field force at point B, then the field strength at point A is greater than the field strength at point B. An object of the same mass, such as an astronaut, experiences a greater gravitational force on the ground than it would in space.

Electric field lines depict the direction in which the positive charge is subjected to a force at that point. Our mass is not negative, it is all positive, and the direction of our force must be perpendicular to the ground. But there are a lot of uncertainties in an electric field, so by looking at the electric field lines, you can know what this electric field looks like.

And where the electric field lines are denser, the greater the field strength.

Gravitational potential energy and point potential energy also have the same place. Mass * (acceleration due to gravity * height) = gravitational potential energy of the object. Charged * (electric potential) = electric potential energy of the object. The height is relative to the height, and similarly, the electric potential is also relative.

Field strength is a vector quantity.

Electric potential and electric potential energy are scalar quantities.

This distinguishes between field strength and electric potential.

Electric potential energy is the potential energy of a charge in an electric field, which is energy, which is different from field strength and electric potential properties, so it should be easy to distinguish.

Field strength is an abbreviation for electric field strength. Equal to the force experienced here by the unit positive charge.

Electric potential is a prescribed noun, just like the relative height in the gravitational potential energy Take the ground as the 0 potential energy surface, then the others correspond to it. The electric potential can be taken at infinity as the potential energy of 0.

Electric potential energy is the work done by moving an electric charge from one potential position to another.

The field strength is determined by the electric charge, and the electric potential is determined by people, if the field strength is compared to the mass, then the electric potential is equivalent to the high degree of the line.

Electric field strengthEqual to the negative gradient of the electric potential.

In words, the strength of the electric field is equal to the negative derivative of the electric potential.

This is actually the case when the beginning of "the electric field strength equals the negative gradient of the electric potential" is applied to one dimension.

If the subject can understand this step, then it is very simple to understand the relationship between electric field strength and electric potential. Directly put the original function.

The relationship with the derivative corresponds to the relationship between the electric potential and the electric field strength: the derivative is equal to zero, and the original function is not necessarily equal to zero; The original function is equal to zero, and the derivative is not necessarily equal to zero.

Since the relationship between the two here is a negative derivative, the greater the strength of the electric field, the faster the electric potential decreases; When the electric field strength is negative (never forget the meaning of a negative field strength), the smaller the field strength, the faster the electric potential rises. When the field strength is equal to zero and changes from positive to negative, the electric potential has a minimum value; When the strength is equal to zero at the spot and it is said to change from negative to positive, the electric potential has a maximum.

In fact, not only the electric field, but also in mechanics there is a similar relationship. For example, in a one-dimensional case, the force is equal to the negative derivative of the potential energy.

Explanation of electric potential:

The scalar potential of the electrostatic field is called the electric potential, or the electrostatic potential. In the electric field, a certain point of charge is auspicious.

The electric potential energy and the amount of charge it carries.

Related to positive and negative, the electric potential energy and the positive and negative of the charge can be brought in to determine the ratio of the potential and the positive and negative of the point, which is called the electric potential of this point (also known as the potential), which is usually expressed by . Electric potential is a physical quantity that describes an electric field in terms of energy.

The electric field strength describes the electric field from the perspective of force. Potential difference.

It is possible to generate an electric current in a closed circuit (when the potential difference is considerable, an insulator such as air.

will also become a conductor). The electric potential is also known as the potential.

The field strength has nothing to do with the electric potential, but the field strength has to do with the electric charge.

Field Strength: The strength of the electric field.

It is a physical quantity used to express the strength and direction of an electric field.

Experiments show that at a certain point in the electric field, the electric field force at which the charge at the test point is subjected.

The ratio to the charge it carries is a quantity that has nothing to do with the charge at the test point.

Electric potential: Electric potential is a physical quantity that describes an electric field from the perspective of energy, and electric field strength describes the electric field from the perspective of force. Potential difference.

It can generate current in a closed circuit. The electric potential is also known as the potential.

The magnitude of the electric field strength indicates how quickly or slowly the electric potential falls along the direction of the field strength.

The magnitude of the electric field strength is not related to the magnitude of the electric potential at a certain point in the electric field, but it is related to the potential difference.

In a uniform electric field, there is: e=u d

e represents the electric field strength, u represents the potential difference between two points in the electric field, and d represents the distance between two points along the direction of the field strength.

The potential difference is the integral of the field strength in the radial direction, so where the algebraic sum of the field strength is zero, the potential difference is also zero. That is, the change in electric potential is related to the field strength, but the electric potential is not related to the field strength.

First, the units are different.

1. Electric potential energy: the unit is joules (j).

2. Electric field strength: the unit is volt-meter (V m) or Newton coulomb (n c). Another commonly used unit is the volt centimeter (v cm).

Second, the expressions are different.

1. In the electric field of the point charge, the potential energy of the point charge is:

ea q a {ea: electric potential energy of a charged body at point a (j), q: electric charge (c), a: potential at point a (v)}

e=kq1q2/r^2

Then under the action of the Coulomb force, the microwork done when the charge moves a tiny distance dr dw=fdr

Assuming that the charge q is fixed now, then when q moves from the place where the distance from q is r1 to the place where r2 (r12, the definition of the electric field strength: e=f q, f is the force of the electric field on the tentative charge, and q is the amount of charge of the test charge (tentative charge) placed at a point in the electric field.

Determinant formula of electric field: e=kq r2 (only for point charges). where e is the electric field strength, k is the electrostatic force constant, q is the amount of electricity of the source charge, and r is the distance between the source charge and the tentative charge.

Electric field force: f=eq.

Third, the nature is different.

1. Electric potential energy is a scalar quantity.

2. The field strength is a vector quantity, and its direction is positive in the direction of the force of the test charge, and its magnitude is equal to the force on the unit test charge. The unit of field strength is volt-meter, and 1 volt-meter = 1 bullhouse. The spatial distribution of field strength can be illustrated by the image of the electric field line.

Electric field strength and electric potential describe the properties of an electric field from two perspectives, respectively

The electric field strength describes the electric field from the perspective of the nature of the electric field, that is, the electric field has a strong effect on the charge placed in it, and the magnitude of the force is f qe, and the purpose of introducing the electric field strength is to understand the action of different points in the electric field on the hall volt charge, so as to further discuss the movement of the Okiyo charge in the electric field.

Electric potential, on the other hand, understands the electric field in terms of energy.

The charge has energy in the electric field (just like the object has gravitational potential energy in the gravitational field), the key is to grasp the relationship between the work done by the electric field force and the change of the potential energy of the charge, similar to the decrease of the gravitational potential energy of the gravitational force to do the work: the electric field force does the work, the electric potential energy of the charge decreases, and the electric field force does how much work, the electric potential energy of the charge decreases; On the contrary, when the electric field force does negative work (or the charge overcomes the electric field force to do work), the potential energy of the charge increases, and the electric field force does the negative work that disperses the work, and the potential energy of the charge increases. and w qu.

The electric field strength and electric potential describe the sexual excitation of the electric field from two perspectives: X0d electric field strength describes the electric field from the perspective of the nature of the force of the electric field, that is, the electric field has a strong effect on the charge placed in it, and the magnitude of the force f qe, the purpose of introducing the electric field strength is to understand the action of different points in the electric field on the charge, so as to further discuss the motion of the charge in the electric field. The x0d potential understands the electric field in terms of energy.

The charge has energy in the electric field (just like the object has gravitational potential energy in the gravitational field), the key is to grasp the relationship between the work done by the electric field force and the change of the potential energy of the charge, similar to the decrease of the gravitational potential energy of the gravitational force to do the work: the electric field force does the work, the electric potential energy of the charge decreases, and the electric field force does how much work, the electric potential energy of the charge decreases; On the contrary, if the electric field force does negative work (or the charge overcomes the electric field force to do work), the leaded potential energy of the charge increases, and the potential energy of the charge increases as much as the electric field force does negative work. and w qu.

Electric field strength and electric potential describe the properties of an electric field from two perspectives, respectively

The electric field strength describes the electric field from the perspective of the force nature of the electric field, that is, the strong effect of the electric field on the charge placed in it, the magnitude of the force f qe, and the purpose of introducing the electric field strength is to understand the action of different points in the electric field on the charge, so as to further discuss the motion of the charge in the electric field.

Electric potential, on the other hand, understands the electric field in terms of energy. The key is to grasp the relationship between the work done by the electric field force and the change of the potential energy of the charge, and the decrease of the gravitational potential energy of the gravitational force can be seen by the electric field force: the electric field force does the work, the potential energy of the charge decreases, and the electric field force does the work, and the electric field force does how much work, the electric potential energy of the charge decreases; On the contrary, if the electric field force does negative work (or the charge overcomes the electric field force to do work), the electric potential energy of the charge increases, and the potential energy of the charge increases as much as the electric field force does negative work.

and w qu.

1. Different definitions.

1. Electric potential energy: refers to the potential energy of the charge distribution in the electric field, which is related to the configuration of the charge distribution in the system.

2. Electric field strength: It is a physical quantity used to express the strength and direction of the electric field.

Second, the units are different.

1. Electric potential energy: the unit is joules (j).

2. Electric field strength: the unit is volt-meter (V m) or Newton coulomb (n c). Another commonly used unit is the volt centimeter (v cm).

1. The definitions are different.

Electric potential energy: Electric potential energy is the potential energy of the charge distribution in the electric field, which is related to the configuration of the charge distribution inside the system.

Electric Field Strength: Electric field strength is a physical quantity used to express the strength and direction of an electric field.

2. The units are different.

Electric potential energy: The unit of electric potential is volts.

Electric Field Strength: The unit of electric field strength is V m volt meter or n c Newton coulomb (these two units are practically equal). Commonly used units are also v cm volts centimeter.

3. The expressions are different.

Electric potential energy: ep=kq1q2 r, wab=epa-epb.

Electric field intensity: e=k*q r 2,k.

The electric field strength is the strength of the electric field, each point in the electric field has a field strength value, you can understand it as a force, the influence of the electric field on the object at the position, the magnitude of the electric field force on the same charged object is proportional to the field strength, and the direction of the two is the same.

Electric potential energy is energy, which can be understood as gravitational potential energy, which is the work done by the electric field.

If it is a uniform electric field, then the electric field force is the same at each position, and the electric potential energy of an object at a position is the energy used by the electric field force to move the object from the zero potential energy surface (artificially prescribed) to its current position, and these energies are like grabic force potential energy being stored in the object.

If the strength of the electric field is not uniform, then the integral calculation should be carried out, which is understood in the same way as the work done by the changing force.

A common case of electric potential energy is the amount by which it changes from one position to another.

The energy that the charge has in the electric field due to the action of the electric field and the ratio of the charge in the charge determines the position is called electric potential energy. It refers to the energy that a charge has in an electric field.

Electric field strength is a physical quantity used to express the strength and direction of an electric field.

Hope it helps.