Use electricity carefully, but don't be afraid to use electricity
The body's response to current is very sensitive. The degree of damage to the human body during an electric shock is related to the following factors. Human body resistance. The body resistance is not constant. In different cases, the resistance values ​​vary greatly, usually between 10 and 100 kilohms. The smaller the body resistance, the greater the current passing through the electric shock, and the more serious the injury. The electrical resistance of various parts of the human body is also different, in which the stratum corneum of the skin has the largest electrical resistance, while the fat, bones and nerves are small, and the muscle resistance is the smallest. If a person suffers from horny damage, his body resistance can be reduced to 0.8 to 1 kilo ohm. In this case, it is most likely to bring life-threatening contact with a charged body. The body resistance is changed. The thinner and moister the skin, the smaller the resistance. The larger the skin contact with the charged body, the tighter the resistance and the smaller the resistance. If the current through the human body is larger, the higher the voltage, the longer the use time and the smaller the resistance. Human body resistance is also affected by physical health and mental state. Such as physical weakness, emotional excitement, drunkenness, etc., easy to sweat, so that the body's resistance dropped sharply, so in these cases it is not appropriate to engage in electrical operations.
Damage to the human body by currents of different intensities. A lot of practice tells us that when the human body passes 1 mA AC frequency or 5 mA DC, there is a feeling of hemp and pain. But 10 mA or so can still get rid of the power. More than 50 mAh is very dangerous. If a current of 100 mA is passed through the body, it will cause respiratory suffocation and the heart will stop beating until it dies.
The current of different voltages harms the human body. The higher the voltage of human contact, the greater the current through the human body, the more serious the damage to the human body. In the actual statistics of electric shock, more than 70% died of electric shock at 220 volts or 380 volts AC. The human body resistance of the electric shock is 1 kilometer, and the current passing through the human body at 220 volts has 220 mA, which can quickly kill people. Through a lot of practice, people found that the voltage below 36 volts has no serious threat to the human body, so the voltage below 36 volts is defined as a safe voltage.
Damage to the human body by currents of different frequencies. Experiments have shown that direct current has a decomposing effect on blood; high-frequency current is not only dangerous, but can also be used for medical treatment. That is, the risk of electric shock decreases with the increase of frequency, and the AC of 40 to 60 Hz is the most dangerous.
The relationship between the action time of the current and the injury of the human body. The longer the current acts on the human body, the smaller the body resistance, and the greater the current through the human body, the more serious the damage to the human body. If the power frequency is 50 mA AC, if the action time is not long, it will not die. If it lasts for 10 seconds, it will cause heart ventricular fibrillation, and the heart will stop beating and die.
The harm of the human body through different ways of passing current. Current through the head stuns; through the spinal cord can cause limb paralysis; if through the heart, respiratory system and central nervous system, can lead to neurological disorders, cardiac arrest, blood circulation interruption. It can be seen that current passing through the heart and respiratory system is the most likely to cause electrocution.
Http://news.chinawj.com.cn Submission:
Insulated Panels,Sip Building Panels,Fiber Cement Board Sips,Fiber Cement Board Sips
Dalian Quacent New Building Materials Co.,Ltd. , http://www.quacenthomes.com