Why doesn t the bird get electrocuted What is the reason

As we all know, power supply is divided into positive and negative poles. When a conductor is connected between the positive and negative poles, an electric current flows through the conductor. Similarly, the transmission line is also divided into two lines: the live wire and the neutral line.

When a conductor is connected between the positive and negative poles, an electric current flows through the conductor. The human body is a conductor, the human body is larger, when it touches the live wire and the neutral line, the two wires are connected together, forming a short circuit, and there is a large current flowing through the human body, which is the reason for the electrocution of the person.

When we do electrical experiments, if we use a voltmeter to measure the voltage on the wire is almost 0, why is this? Because the resistance of the wire is basically 0, the voltage of the wire is very small and almost 0 from Ohm's law.

Due to the small size of the bird, it only touches one wire, and its body is connected in parallel with the wire it is standing on, and it can also be considered that the wire has shorted the bird, and there is no current passing through the body, so they will not be electrocuted.

The following is a concrete calculation to illustrate this problem:

It turned out that the two paws of the bird were standing on the same wire. The 220,000 volt high voltage LGJ steel-core aluminum stranded wire has a cross-sectional area of 95 mm2 and a permissible throughput current of 325 amperes. If the distance between the bird's paws is 5 cm, the resistance of this 5 cm wire is only 1 63 10-6 ohms, and the voltage at both ends of the wire is U ir, which does not exceed 5 3 10-3 volts.

This is the voltage applied to the bird. If the resistance of the bird's body is 10,000 ohms, then the current through the bird's body is only 0 53 microamps. The current is weak, so the bird will not be electrocuted.

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The bird has two feet on the same wire, and the resistance of the wire is less than that of the bird's body, so the current passes through the wire. If you grab a wire with both hands at the same time, and you don't touch the ground, you won't get electrocuted (don't try it). If the bird steps on two wires with both feet, it will be electrocuted and cause a short circuit at the same time.

An electric shock must touch both the neutral wire and the live wire, and the bird only touches one wire, and of course it will not be electrocuted.

If a person grabs a line of fire and stands on the ground, he will also be electrocuted. Because there is a ground wire.

It is a very dangerous thing for people to touch the high-voltage line, so parents and teachers will educate us to stay away from this danger from an early age, but if you look closely, you will find that the bird not only dares to approach the high-voltage line, but also dares to stand on it and sing loudly! Why are we in danger and the birds are fine?

The reason why the bird will not be electrocuted on the wire: because the bird is small, it only touches one wire (the bird's feet are on the same wire, and there is almost no wide electric potential difference between the two feet), its body and the wire it is standing on are equipotential, and there is no electric current on the body, so they will not be electrocuted.

Electric shock: It is caused by the direct contact of the human body with the power supply, and a certain amount of current passes through the human body, resulting in tissue damage, dysfunction and even death. The longer the electric shock, the more severe the electrical damage to the human body.

Lightning strikes in nature are also a form of electric shock, and their voltages can be as high as tens of millions of volts, causing extremely strong currents and extremely harmful electric shocks.

Electricity is divided into positive and negative poles. When a conductor is connected between the positive and negative poles, an electric current flows through the conductor. Similarly, wires are also divided into positive and negative wires.

When it touches the wire, the two wires are connected together to form a short circuit, and there is a large current flowing through the human body, which is the reason why the person is electrocuted. Since the bird is smaller, it only touches one wire, its body and the wire it is standing on are equipotential, and there is no electric current passing through the body, so they will not be electrocuted.

However, if the snake climbs on the power line, it is dangerous, its body is long, and when it climbs on the high voltage line, it will connect the positive and negative two together, causing electrocution. Rats that burrow into power distribution rooms are also often electrocuted to death.

We also know that the live operation of electrical workers on the high-voltage line is the same as the reason why a bird stands on a wire, so it can operate safely.

Birds such as magpies and crows like to build their nests on power poles, which is also very dangerous, which can easily form short circuits and cause disasters.

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Because the bird has the same voltage between its feet and there is no potential difference, it will not be electrocuted. Even if a person has two feet on the same power line, and his body does not touch another wire or conductor, he or she will not be electrocuted. The reason is still the same:

There is no potential difference between the feet, and there is no electric current flowing through the human body without electric shock. But no one touches it for no reason, unless you're an electrician, and it's a job need. Some people say that it is wrong for a bird's foot skin not to be electrocuted if it does not conduct electricity.

There is also the problem of "step voltage, the bigger the step, the greater the voltage between the feet; The smaller the stride, the less voltage there is between the feet. Because the bird is small, the stride is too small, and the stride voltage is too small (negligible) to not be electrocuted" and so on are also wrong. Because the overhead wire only falls into the ground, so that the earth is electrified, the farther away from the wire, the lower the voltage, at this time, if people accidentally walk into the sun, then there is a potential difference between the two feet, this is the "step voltage", there will be a current flowing through the human body and electrocution.

The first aid is to carefully and slowly jump out of the electrified area with one foot. Because there is no potential difference in the one-legged human body, there will be no electric current flowing through the body and there will be no electric shock. This loss of Kailu is very important and must be noted.

The swallow stands on the high-voltage line, forming a closed loop between its feet and the high-voltage line.

Electric shock generally refers to a certain current flowing in the human or animal body, thereby causing certain damage to the organism, as long as there is no current in the body, it will not form an electric shock. There are two conditions for the generation of electric current, one is a closed loop, and the other is a potential difference (which can be compared to the flow of water from a high place to a low place), and the two conditions are indispensable.

The swallow stands on the high-voltage line, and the shape between the feet and the high-voltage line has become a closed loop, but the distance between the feet is too small, and the potential on the feet can basically be regarded as equal, and there is no potential difference, so there will be no current flowing through the swallow's body, and the electric shock will naturally not be formed.

Precautions for electrocution of birds:

Birds can stand on the high-voltage line is not that they are not afraid of electric shock, but there is no condition for electric shock, under certain conditions, they will also be dismantled by the slag, for example, the birds on the two lines will form an electric shock, but the probability of this phenomenon is very small.

The resistance of high-voltage wires is very small, while the resistance of humans or animals (including swallows) is much larger. In addition, the distance between the two feet of the swallow is small, and the resistance of the wire between the two feet on which it stands is even smaller, and the resistance ratio of the swallow's body can almost be ignored.