The stool has a temper and the family is ruined, how to insure each stool at home?

Now every family will prepare some additional stools in addition to the sofa for the home, which is because when the number of people in the family is relatively large, in fact, the sofa is not enough to sit, so many families will prepare some stools. However, you will find that when using these stools, there are often more dangerous things.

Because many stools are not stable, they will always cause people to fall, in fact, this is due to the fact that most homes now lay the floor is tiledAnd these marble tiles actually have a very smooth surface. Therefore, it is difficult for most stools to have a relatively large friction between them, so when people sit on them, it is easy to fall.

In fact, at this time, you can increase the friction of the stool to prevent him from falling, many families will buy some non-slip mats, in fact, non-slip mats are more criticalEspecially for those families with marble floors, the marble surface is smoother and therefore increases its friction.

Tie the non-slip mat under the leg of the stool to increase the friction between it and the marble surface. You won't fall when you sit on it. In fact, in addition to this situation, you can also replace some stools with high friction.

In fact, for those families who install marble floors, its material is also very critical when choosing a stool. You will find some plastic stools, they themselves are not very stable, plus their surface is relatively smoothTherefore, it is easy to fall, so you can choose some wooden stools when shopping.

Now the home is paved with floor tiles, and some chairs are not slippery and easy to fall, so you can buy a non-slip mat and install it.

First of all, consider whether the stool is loose, and also pay attention to the weight that can be tolerated

Old or long-term stools will basically loosen the legs, rungs and railings. In the face of this situation, you can actually start from different angles, for example, for the joints on the stool that are too strong, you need to gently shake the parts to break the adhesive effect of the glue before the stool parts can be removed and reinstalled, if necessary, you can use self-locking pliers.

It should be inspected once every six months, and if there is a danger, it should be dealt with in time.

When buying a stool, you should consider the quality of the stool, and repair it in time once the stool is loose in the later stage.

Stiffen the joints of the stool with a hammer, and then use a rope to start winding along the surface of the stool, and after wrapping the surface of the stool, the stool will be strong.

Before sitting on a stool, you should first look at the weight of the stool, if it is not suitable for you, it is safer to make a sofa.

In other words, this kind of dangerous stool is not good if it hurts someone.

Reinforcement the joints of the stool with a hammer and nails, and by the way, reinforce each stool.

Replace dangerous stools in time and check them before sitting.

e There are many explanations:

1. Energy: unit: J (joules), EK is kinetic energy, EP is potential energy, E0 is photon energy (E0 H), E is total energy of the system, and ΔE is the energy released by mass loss (ΔE=MC 2).

2. Field strength: unit: n c or v m, where e=f q=u d.

Electricity is one of the sub-disciplines of physics. His research focuses on the formation of "electricity" and its applications. In the West, the word "electricity" is derived from the Greek word amber, and in China it is derived from the phenomenon of lightning and lightning.

Since the middle of the 18th century, the study of electricity has been flourishing. Each of its major discoveries has led to extensive practical research, which has led to the rapid development of science and technology. Nowadays, electricity is inseparable from human life, scientific and technological activities, and material production activities.

With the development of science and technology, some research contents with specialized knowledge have gradually become independent and have formed specialized disciplines, such as electronics and electrical engineering. Electricity, also known as electromagnetism, is a fundamental discipline of great significance in physics.

The electric effect in matter is the link between electricity and other physical disciplines, even non-physical ones. There are many types of electrical effects in matter, many of which have become or are gradually developing into specialized fields of study. For example:

Electrostriction, piezoelectric effect (electrical and polarity produced by mechanical pressure on a dielectric crystal) and inverse piezoelectric effect, Seebeck effect, Peltier effect (at the junction of two different metals or semiconductors, heat is released when an electric current passes in one direction and heat is absorbed when the current is reversed), Thomson effect (a metal conductor or semiconductor maintains a temperature gradient that releases heat when the current passes in one direction and absorbs heat when the current is reversed), thermistors ( Resistance in semiconductor materials changes sensitively with temperature), photoresistors (resistance in semiconductor materials changes sensitively with light), photovoltaic effect (potential difference in semiconductor materials due to illumination), and so on.

The study of various electrical effects helps to understand the structure of matter and the basic processes that occur in it, and they are also technically the basis for energy conversion and non-electric electrical measurements.

The contents of electrical research mainly include electrostatics, magnetostatics, electromagnetic fields, circuits, electromagnetic effects, and electromagnetic measurements.

Giber made the first electroscope in the experiment.

Electrostatics is a discipline that studies the electric field generated by a stationary charge and the law of the electric field on the charge. There are only two types of electric charges, which are called positive and negative. The same charge repells each other, and the different charges attract each other.

Electric charges obey the law of conservation of electric charges. Charge can be transferred from one object to another, and the algebraic sum of charge remains constant in any physical process. The so-called charging is nothing but the separation or transfer of positive and negative charges; The so-called disappearance of electric charge is nothing but the neutralization of positive and negative charges.

A total of 20 photos. Nature's lightning.

The interaction forces between the charges at rest conform to Coulomb's law: in a vacuum, the magnitude of the force acting between two charges at rest is proportional to the product of their charge and inversely proportional to the square of the distance between them; The direction of the force is along the line between them, with the same charge repelling and the different charge attracting.

The interaction force between the charges and the charges interacts through the electric field generated by the charges. The electric field produced by the charge is described by the strength of the electric field, or field strength for short. The electric field strength at a point in space is defined by the electric field force exerted on the charge at that point in positive units, and the electric field strength follows the principle of superposition of field strengths.

Ordinary substances can be divided into two cases according to their conductive properties: conductors and insulators. There is a movable free charge present within the conductor; An insulator, also known as a dielectric, has only a binding charge in its body.

Under the action of an electric field, the free charge in the conductor will produce a movement. When the composition and temperature of the conductor are uniform, the condition for electrostatic equilibrium is that the electric field strength inside the conductor is equal to zero everywhere. According to this condition, several properties of the electrostatic equilibrium of the conductor can be derived.

The study of electricity began to enter the ranks of science.

Magnetostatics is the study of the magnetic field generated when the current is stable and the force exerted by the magnetic field on the current.

The directional flow of the charge forms an electric current. There is a magnetic interaction between the electric currents, and this magnetic interaction is transmitted through a magnetic field, i.e., the electric current creates a magnetic field in the space around it, and the magnetic field exerts a force on the electric current placed in it. The magnetic field generated by an electric current is described by the intensity of magnetic induction.

Electromagnetic field is the study of electromagnetic phenomena and laws over time.

When the magnetic flux passing through the coil of a closed conductor changes, an induced current is generated on the coil. The direction of the induced current can be determined by Lenz's law. The induced current in the closed coil is the result of the induced electromotive force pushing, which follows Faraday's law:

The magnitude of the induced electromotive force on a closed coil is always proportional to the rate of change in time of the magnetic flux passing through the coil.

Maxwell's equations describe the laws that electromagnetic fields generally obey. Combined with the dielectric equation of matter, the Lorentz force formulation, and the law of conservation of charge, it can, in principle, solve various macroscopic electrodynamic problems.

An important result derived from Maxwell's equations is the presence of electromagnetic waves, the changing electromagnetic field propagates in the form of electromagnetic waves, and the speed of propagation of electromagnetic waves in a vacuum is equal to the speed of light. This also shows that light is also a type of electromagnetic wave, so the wave theory of light is included in the category of electromagnetic theory.

1. Ohm's Law Section.

1 i = u r (Ohm's law: the current in a conductor is proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor).

2． i=i1=i2=…=in (characteristic of the current in a series circuit: the currents are equal everywhere).

3． u=u1+u2+…+un (characteristic of voltage in series circuits: in series circuits, the total voltage is equal to the sum of the voltages at both ends of each part of the circuit).

4． i=i1+i2+…+IN (characteristic of the current in a parallel circuit: the current on the main circuit is equal to the sum of the currents in each branch).

5． u=u1=u2=…=un (Characteristics of voltage in parallel circuits: The voltage at both ends of each branch is equal. are equal to the supply voltage).

6． r=r1+r2+…+rn (characteristic of resistance in series circuits: the total resistance is equal to the sum of the resistances of the parts of the circuit).

7． 1/r=1/r1+1/r2+…+1 rn (characteristic of resistors in parallel circuits: the reciprocal of the total resistors is equal to the sum of the reciprocals of the various parallel resistors).

8 r and = r n (the formula for finding the total resistance when n identical resistors are connected in parallel).

9 r string = nr (the formula for finding the total resistance when n of the same resistor in series).

10 u1:u2=r1:r2 (the relationship between voltage and resistance in a series circuit: the ratio of voltage is equal to the ratio of resistance to which they correspond).

11 i1:i2=r2:r1 (the relationship between current and resistance in parallel circuits: the ratio of current is equal to the inverse ratio of the resistance to which they correspond).

2. Electric power part.

12 p=ui (empirical, suitable for any circuit).

13 p=w t (defined, suitable for any circuit).

14 q=i2rt (Joule's law, suitable for any circuit).

15．p=p1+p2+…+PN (suitable for any circuit).

16 W=UIT (empirical, suitable for any circuit).

17.p=i2r (composite formula, only suitable for purely resistive circuits).

18.p=u2 r (composite formula, only suitable for purely resistive circuits).

19.w=q (empirical, only suitable for purely resistive circuits.) where w is the work done by the current flowing through the conductor and q is the heat produced by the current flowing through the conductor).

20.w=i2rt (composite formula, only suitable for purely resistive circuits).

21.w=u2t r (composite formula, suitable only for purely resistive circuits).

22 p1:p2=u1:u2=r1:r2 (the relationship between electrical power and voltage and resistance in a series circuit: in a series circuit, the ratio of electrical power is equal to the ratio of voltage and resistance corresponding to them).

23．p1:p2=i1:i2=r2:

R1 (the relationship between electrical power and current and resistance in parallel circuits: in parallel circuits, the ratio of electrical power is equal to the ratio of the current corresponding to them, and equal to the inverse ratio of the resistance they correspond!!

The (basic) knowledge of electricity is electricity.