Common sense of physics: Why can 220V AC electrocute people while 220V DC power does not?

Let me tell you a basic common sense, for the human body, the voltage below 36V is safe, when the voltage is higher than 36V, it will cause electric shock. However, the injury caused by electric shock depends on the state of the human body at that time, and the resistance of the human body is not stable. However, according to your question, if the human body is directly connected to the circuit, if there is no other resistor in this circuit, people should finish playing, but there is an exception, there is a resistance in the circuit that connects your human body to a much larger resistance than yours, and it is connected in series with you, you are safe, because as long as the voltage distributed to you is less than 36V, it will be fine.

First of all, 220V DC can also electrocute people, don't try, secondly, upstairs has explained the difference between alternating current and direct current and the specific meaning, more than 36V alternating current in the city DC can cause harm to people, relative to the given value, AC has a higher actual voltage than DC, so it is more harmful to the human body.

Nonsense, regardless of DC AC, it can electrocute people.

will electrocute people, it depends on how much power it has!

Who told you that 220 DC doesn't die? DC is set with a safe voltage of 36V!

It will electrocute people. The human safety voltage is not higher than 36 volts, not to mention 220 volts, I hope everyone should use electricity safely.

Of course, whether it is commercial electricity or industrial electricity, after the human body is electrocuted, there is a danger to life. We must know that the human body belongs to semiconductors, and as long as the voltage is higher than 36 volts, it will cause danger to the human body. Many people inadvertently die of electric shock at home, because the voltage of household electricity is relatively high, 220 volts, so if you are electrocuted, and the voltage is 220 volts, it will lead to death.

Precautions for safe electricity use in rainy weather.

Check whether the indoor leakage protection device is normal, do not rush to recover after the leakage protection device trips or the fuse is blown out, and carefully check that the indoor lines and electrical equipment are not abnormal before resuming power transmission.

Continuous rainfall, indoor dampness, contact with electrical appliances should ensure that hands and feet are dry, wear shoes made of insulating materials (such as dry plastic shoes, leather shoes), need to move electrical equipment, before the plug is removed, to ensure that the power is off.

220V household electricity electrocuts people.

The industry stipulates that the safety voltage is not higher than 36V, the continuous contact safety voltage is 24V, and the safety current is 10mA. The degree of harm to the human body of electric shock mainly depends on the size of the current passing through the human body and the length of the power on time.

The greater the current intensity, the greater the fatal danger; The longer it lasts, the more likely it is to die.

The minimum value of current that can be perceived by a person is called the perceived current, which is 1 mA for AC and 5 mA for DC; The maximum current that a person can get rid of after an electric shock is called getting rid of the current, which is 10mA for AC and 50mA for DC; The current that is life-threatening in a relatively short period of time is called a lethal current, such as a current of 100mA passing through the human body for 1s, which can be enough to make a person fatal, so the lethal current is 50mA.

In the case of protection against electric shock, the current allowed by the human body can generally be considered as 30mA.

Summary. Dear, I'm glad to serve you Yo 220V voltage can electrocute people, but if it's just an electrical injury, it's also very serious.

Dear, I'm glad to serve you Yo 220V voltage can electrocute people, but if it's just an electrical injury, it's also very serious.

Kiss! The first thing to be clear is that it is the electric current, not the voltage, that electrocutes a person. When a person is electrocuted, the current implicit finger is the direct factor that causes the injury, the larger the current, the more serious the injury, the more serious the damage has been verified to make it clear, when the current through the human body exceeds 50 milliamperes, the electric shock injury will endanger the life of the person, and the electrocuted person is not easy to get out of the power supply by himself.

The resistance of the human body is generally between 800 ohms and 10,000 ohms with tremors. Calculate the resistance of the human body at 800 ohms, and add 40 volts to the human body through a current of 50 milliamps. Therefore, in general, a voltage of less than 36 volts is specified as a safe voltage.

A voltage of 220 volts can electrocute a person. A power supply with a voltage of less than 36 volts is safe and will not cause harm to the human body, and a voltage of 220 volts will electrocute a person after passing through the human body.

Under normal circumstances, the human body passes 50 milliamps of electricity per second to be life-threatening. In a humid environment (such as in the shower), 12 volts can knock a person down.

However, it is also believed that the external resistance of men is 2000 ohms, while women are less than about 1000 ohms relative to men. In general, the body resistance of 220V power frequency voltage is 500 ohms, and the resistance is within 2000-1000 ohms. Based on the calculation of i=u r, the current of more than 100mA flows through the human body, and there is almost no hope of survival.

Therefore, it is not necessary that 220V can electrocute a person, mainly depending on the specific current through the human body.

Measures after electric shock:

Quickly cut off the main power supply, and use insulation to separate wires and electrical appliances from the wounded to avoid successive electric shocks.

If the person is conscious, the person should lie down and rest quietly. Do not allow the person to move around to reduce the burden on the heart, and closely observe the changes in their breathing and pulse.

If the person is unconscious, weak or stops breathing, CPR should be given immediately. <>