Why can a bird stand on a power line without being electrocuted?

In order to understand the reason why the current does not harm the bird, we should pay attention to such a thing: when the bird stops on the wire, the bird's body is like a branch in the circuit, and the part of the short wire between the two feet of the bird is also a branch in the circuit, because the size of the resistance is related to the length of the conductor, the shorter the conductor, the smaller the resistance, the greater the current, so the resistance of the former is obviously much greater than the latter. Therefore, the current in the bird's body is very small, so small that it is not harmful to the bird.

Have you ever observed that birds have a habit of grinding their beaks on electric wires when they stop on the cross arm of a high-voltage power pole? You must be wondering: they should have died of electrocution, why did they survive?

Oh, yes! Because the cross arm is not insulated, the bird resting on it is connected to the ground. In this way, as soon as the bird touches the electric wire, it will inevitably be electrocuted to death.

But they were not electrocuted, because people had long thought about this, and in order to prevent the death of birds, people installed insulated shelves on the cross arms of high-voltage wires. Not only can the birds be safely parked on it, but they can also grind their beaks on the wires. There are also special devices installed in dangerous places so that birds cannot touch them.

That's all that the brother said above.

Not really. You said that there was an insulator in the wire.

What if there are some wires that leak electricity?

It's not impossible.

And how to explain this.

The correct answer should be that the bird has an insulating layer of skin growing on its paws.

I don't remember what it was.

However, this is the reason why birds are not electrocuted.

Because no electric current flows through its body.

There are two conditions that must be met for the current to flow, one is that there is a voltage, and the other is that there must be a loop. The bird standing on the wire only has voltage, but there is no circuit, so it will not be electrocuted.

Electric shock is a common name for electrical injury, which usually refers to the tissue damage and dysfunction caused by the human body directly touching the power supply or high-voltage electricity passing through the human body through air or other conductive media to transmit the current through the human body, and in severe cases, cardiac and respiratory arrest occur. High voltages above 1000V can also cause burns. Lightning damage (lightning strike) falls under the category of high-voltage electrical damage.

There are many causes of electrical injuries, mainly lack of knowledge of safe electricity use, installation and maintenance of electrical appliances, wires not operating according to regulations, and hanging clothes on wires. High temperature, high humidity and sweating reduce the surface resistance and easily cause electrical damage. Electrical damage can be caused by electrical injuries caused by electrical wires broken and falling to the human body during an accident, taking shelter from a tree during a thunderstorm, or being struck by lightning with an umbrella with an iron handle.

The reasons why the bird will not touch it when standing on the wire are:

Because no electric current flows through its body.

There are two conditions that must be met for the current to flow: there must be voltage, and there must be a loop (the loop is the path through which the current flows). The bird satisfies the first condition on the wire, but not the second. So there will be no electric shock.

In fact, even if a person stands on a single wire, he will not be electrocuted. The reason is simple, the premise of electric shock is to have a conductive circuit. Take, for example, residential electricity. Residential electricity consumption is generally single-phase, with a live wire and a neutral line.

The live wire has a voltage of 220 volts to ground and the neutral line has a voltage of zero to the ground, so it can be considered that the neutral line is grounded. There must be a circuit when you are electrocuted, that is, you must touch the live wire, and at the same time touch the neutral line or the earth, to be electrocuted.

People are generally electrocuted by standing on the ground, the body is in contact with the fire wire, and the current flows from the wire through the human body to the earth, and then through the earth flow back to the grounding point of the power system, forming a loop.

Bird standing on the wire will not be electrocuted because there is no pathway.

1. A layer of cuticle on the bird's feet, which has an insulating effect. The bird itself has resistance, and it is only equivalent to a small section of resistance at the bird's foot and connected a large resistor. The change in the resistance of the wire itself is negligible, and the current from the trunk circuit does not go away.

The equivalent resistance of the bird itself is connected in parallel to much less than the resistance of its wire, and only a tiny amount of current will flow through the bird without posing a threat, and the result is high voltage.

Although very high-voltage, the voltage is concentrated on the load, and the voltage drop on the bird tends to be 0.

2. The bird is not electrocuted when standing on the wire because it only touches the fire wire or only touches the ground wire, and cannot produce a loop, so it does not conduct electricity, if it has one foot on the fire wire and one foot on the tower, it will definitely be electrocuted.

3. The formation of the current requires a current circuit, and it will not be electrocuted if it only touches a wire, but if the bird's body touches two wires at the same time or the bird standing on the wire grinds its mouth on an uninsulated pole or rack, there will be an electric current flowing through the bird, causing it to be electrocuted.