What are the effects of current on the human body
After the current passes through the human body, it can cause the muscles to contract and produce movement, causing mechanical damage. The thermal and chemical effects of the current can cause a series of sudden pathological changes, causing serious damage to the body, especially when the current flows through the heart and damages the heart. Very serious. Very small currents can cause ventricular fibrillation, leading to death. The degree of electric shock injury to the human body is related to the type, size, route, contact location, duration, human health state, and mental state of the current.
1. The greater the current through the human body, the greater the impact on the human body, therefore, the higher the contact voltage, the greater the damage to the human body. Generally, voltages below 36 volts are regarded as safe voltages. But in a particularly humid environment, even if you touch a 36-volt power supply, it is life-threatening, so in this place, a 12-volt safe voltage is used.
2. The damage effect of alternating current on human body is greater than that of direct current, and the impact of different frequency alternating current on human body is also different. The human body is much more sensitive to power frequency alternating current than direct current. When it is exposed to direct current, its intensity reaches 250 milliamperes and sometimes does not cause special damage. When it is exposed to 50 Hz alternating current, as long as 50 milliamperes of electric current passes through the human body, if it lasts for decades, In seconds, it can cause fibrillation of the heart ventricle, which can lead to death. In the alternating current, the current of 28-300 Hz is the most harmful to the human body, and it is easy to cause ventricular fibrillation. The AC current above 20,000 Hz has little effect on the human body, so it can be used for physical therapy. The power frequency AC power supply that we usually use is 50 Hz, which is more reasonable from the perspective of designing electrical equipment. However, the current of 50 Hz is more harmful to the human body, so we must be vigilant and do a safe job of using electricity.
3. The duration of the current is closely related to the degree of injury. The short duration of the energization has little effect on the body; the long duration of the energization will cause great damage to the body and increase the risk. Especially the current continues to flow through the human body more than the human. The heart threatens the heart during the pulsation cycle, and it is easy to produce ventricular fibrillation.
4. When the current path through the human body is different, the damage to the human body is also different. The greater the current intensity through the heart, lungs, and central nervous system, the more severe the consequences. Because different parts of the body touch the charged body, the current path through the human body is different, so the intensity of the current flowing through each part of the body is also different, and the damage procedure to the human body is also different. Therefore, although the total current through the human body, the intensity is equal, but the current path is different, and the consequences are also different.