Stepping on an insulator will be electrocuted, and a person standing on the insulator will not be el

Whether you step on the insulator or not, it is impossible to get electrocuted by simply touching the live wire or neutral wire.

When an electric shock occurs, an "electric current" passes through the body, causing damage.

A sufficient and necessary condition for the formation of an "electric current" is a potential difference (voltage difference) circuit.

1. The electric potential of the zero line is zero (you can refer to the power generation principle of alternating current), which is equivalent to the earth, that is: the earth zero line; The voltage of the live wire fluctuates. Therefore, the addition of the human body as a conductor between the fire line and the earth will form a circuit, causing electric shock.

2. When a person steps on an insulator and destroys the circuit established by the fire wire on the earth, he will not be electrocuted. As soon as the person's other hand touches the neutral line, the circuit is established again, and the person is electrocuted.

3. People grasp the live wire and the neutral line on the ground at the same time, and establish two circuits, at this time, the total resistance is the resistance of a parallel circuit, the resistance is smaller than the first two, and the current is also the largest.

As for whether to die quickly or not, this one will not be discussed, in short, the last one is the most dangerous.

The person grabs the live wire with one hand on the insulator and the zero wire with the other.

Electricity flows between the left and right hands of the person, and you don't have to think about the time.

As long as the voltage is big enough, the person dies instantly, because the speed of the electric current is nine out of ten.

If a person grabs the line of fire on the ground, it is the same as in the previous case.

Because it can be assumed that the zero line is the earth, so the situation is the same.

If you are on the ground, grab the line of fire with one hand and the zero line with the other.

Of course, the resistance between the two hands is small because the distance is short.

But you and Ben don't have to think about it, because death is just a short time, and to be honest, it's impossible to calculate in reality.

First of all, this question is based on the premise that the voltage difference is large enough to electrocute a person, otherwise it is impossible to discuss which case the person is electrocuted first.

I'm telling you, this thing has to be studied by experiments, so don't speculate here!

One of the 3 types will be shorted.

You know, the premise is that the live line and the zero line are used for experiments.

1 Turn off the switch.

Cut off the power and then come to the rescue. If the power cannot be turned off, you can use a wooden stick, bamboo pole, etc. to pick the wire away from the body of the electrocuted person. If you can't pick up the wires or other live electrical appliances that cause electric shock, you should use a dry rope to drag the electrocuted person away and make him out of the current.

It is best for rescuers to wear rubber gloves, rubber sneakers, etc. Do not use your hands to pull the electrocuted person, and do not forget your own safety because you are eager to save people.

2 If the injured person is conscious, breathing and heartbeat are autonomous, the injured person should be allowed to lie flat on the spot, closely observed, and do not stand or move around for the time being, so as to prevent secondary shock or heart failure.

3 Call an ambulance immediately when the injured person is unconscious and try to wake the injured person. If the breathing stops and the heart beats exists, lie flat on the spot and unbutton the clothes, clear the airway, and immediately mouth-to-mouth artificial respiration. If cardiac arrest and breathing is present, chest compressions should be performed immediately.

a. You can't pull away the person who is electrocuted with your hands, so you will also be electrocuted, so A is wrong;

b. Cut the wire with scissors, so that you will also be electrocuted, so B is wrong;

c. Calling the police or calling an electrician will delay the time and lose the best rescue time, so C is wrong;

d. When someone is found to be electrocuted, the measures that should be taken immediately are: quickly cut off the power supply or pick up the wire with an insulator, so D is correct

Therefore, choose D

a. If a person stands on an insulator, if he contacts the neutral line and the live wire at the same time, an electric shock accident will also occur, so a is wrong and in line with the topic;

B, the line from the live wire must be connected to the switch first, and then connected to the electrical appliances, so that it can play a role in preventing electric shock, so B is correct, but does not meet the topic;

c. For high-power or electrical appliances with metal shells, the electrical shells are electrified, otherwise personal safety will be endangered, so C is correct, but it does not meet the topic;

d. The function of the fuse is to fuse itself to cut off the current when the current in the circuit increases to a certain extent, so D is correct, but it does not conform to the topic

So choose A

This will cause an electric shock, because you touch the leaking electrical appliance and your feet are on the ground, and you are actually acting as a conductor. The electric current is passed through your body and then directed into the earth by the leakage appliance, so that you will be electrocuted. Rubber, plastic, porcelain, etc. are good insulators; As long as there is an electric current passing through your body, it is an electric shock, and to prevent electric shock, that is, your body and the power supply cannot form a closed circuit (the current flows out of the positive electrode and the negative electrode flows in to form a circular path), so if you put the insulator under your feet (because the home circuit is connected to the earth), it is like disconnecting the switch will not form a current, so you will not be electrocuted!

1. Electric shock refers to the electric current that is injured by the voltage applied to any two points of the human body.

2. Since people touch and their feet stand on the ground, between hands and feet are the two situations that are the easiest for current to flow. Therefore, wearing insulated gloves on your hands and insulated shoes on your feet can prevent most of the electric shock.

3. The voltage is high and low, and the dielectric strength and impedance must be changed accordingly, that is to say, if the equipment configuration is not suitable, it will not have the effect of preventing electric shock. Just as in your question, holding the insulator in one hand, touching the leaking electrical appliance with the other hand, and standing on the ground with both feet, the foot and the hand you are electrocuted form an electric shock circuit, so it is easy to form a pathway, although it will not hurt you, but you will definitely feel numb, if you wear insulated shoes on your feet, there will be no problem. (Note that here you are assumed to be electrocuted at 220V low voltage).

First of all, the ground is a conductor. So you are standing on the ground ... Holding an insulator in your hand is completely ineffective.

Still electrocuted. The first thing to understand here is the role of insulators. He is a bad conductor of electric current.

Usually use it to act as a tissue electrical current to form a circuit in your body. Thus stopping the electric shock. So..

When you hold it in your hand. There are also loops that exist. Electricity can flow out of the soles of the feet.

So the correct way is to have the insulator underfoot. Or.. Take the leakage electrical appliance through the insulator.

Other than that. Insulators are affected by their own properties. There is a maximum value for the obstruction of the current...

After exceeding. May be broken down. So..

Only the blocking effect of the insulator is sufficient. And if you use it correctly, you can prevent electric shock.

No, the insulator should be between you and the live conductor or between the conductor at the other end, as in this example, holding the insulator in your hand to touch the leaking electrical appliance or standing on the insulator.

When the voltage is too high, sometimes your insulator is useless, especially the high voltage will produce an arc point (people suck it directly).

lz give a point、、Pure hand hit - -

It depends on the thickness of the insulator.

If it is high pressure, even air can penetrate it.

No, even if it is an insulator, it will not conduct electricity.

When our bodies come into contact with high-voltage wires, we can get electrocuted and even die. But if we use a dry stick to touch a high-voltage power line, we won't be electrocuted, what is the reason?

In 1886, Hertz succeeded in proving that two electrical oscillations could cause resonance phenomena, and subsequently proved the existence of electromagnetic oscillations. On November 5, 1887, he summarized the results of his experiments and wrote them in an article entitled "On the Induction Phenomena Caused by the Electrical Process in Insulators" and sent it to his mentor Helmholtz.

Let's talk about the insulators he mentioned with the help of Hertz's ** topic. An insulator is a class of substances that do not conduct electricity. In daily life, we know that when the metal wire is connected to both ends of the power supply, there is an electric current flowing through the wire, and the actual application is based on this principle to use electrical appliances.

We can use wires to divert electricity from the power plant in the far reaches of Fengyu to various homes, and drive electrical appliances such as televisions and refrigerators to work. The metal wire is the conductor and it conducts electricity.

There are many substances that can be used as conductors, and in addition to metal materials, earth, salt water, and the human body are all conductors, and the air that breaks down is also a conductor.

In addition to conductors, there is also a class of substances that do not conduct electricity at all, such as bakelites, dry sticks, ceramics and dry air, which are all insulators and cannot conduct electricity. We can use them to isolate conductors, such as wrapping a layer of rubber on the outside of two wires that are close together, which can not only prevent the two wires from touching each other and short circuit, but also prevent us from accidentally touching the wires and being electrocuted. Air is also an insulator, so we don't have to worry about electric current being transmitted through the air to our body and electrocuted.

Conductors and insulators also convert into each other: for example, dry air is an insulator, but when the electric field is greater than 30,000 volt centimeters, the air will break down and ionize, thus becoming a conductor that can conduct electricity. Another example is that the aqueous solution of table salt can conduct electricity, but after crystallization, the salt becomes an insulator and has no ability to conduct electricity.

Now that we understand the properties of conductors and insulators, let's take a look at human electrocution. Both the human body and the earth are conductors and can conduct electric current, so when the human hand comes into contact with an energized conductor, the current will flow through the human body to the ground, forming a conductor-body-earth circuit. When the current flows through the human body, it has a strong bad effect on the organic tissues of the human body, such as the heart, the brain, etc., when the current reaches a certain value, the heart and brain will lose their working function, resulting in the death of the human body.

By Ohm's law i=u r

The resistance value of the insulator is very large, when a person stands on the insulator, the total resistance of the circuit is considered to be infinity, and the current is 0, that is, a closed loop cannot be formed, so why do people stand on the insulator without electric shock.

For 220V voltage, in case (1), there will be an electric shock;

In cases (2) and (3), there will be no electric shock;

In the case (4), depending on the person, some people will not be electrocuted, while others may have a slight electric shock.

In the fourth case, if you step directly on the ground, you will be electrocuted.

2 3 4 There is no risk of electric shock.