论文部分内容阅读
人体是导体,人体的电阻是多大?怎样计算人体的电阻呢?人体的电阻与哪些因素有关呢?我们通过下面两个例题来探究这些问题.一、人体电阻的估算人体电阻的大小,可以由安全电压、电流,根据欧姆定律进行估算.例1照明电路的电压为220V;对人体来说,一般情况下36V以下的电压是安全的:通过人体的电流达到1mA时会引起麻的感觉;通过人体的电流达到10mA时有危险;超过20mA时有生命危险.根据以上数据估算,普通人体电阻最接近于().
The human body is a conductor, how much is the resistance of the human body? How to calculate the resistance of the human body? The resistance of the human body is related to which factors? We explore these problems through the following two examples: 1. The estimation of the human body resistance The magnitude of the human body resistance can be determined by The safety voltage and current are estimated according to Ohm’s law. The voltage of the lighting circuit in the example 1 is 220V. For humans, the voltage below 36V is generally safe: when the current of the human body reaches 1mA, it will cause a numbness; When the human body’s current reaches 10mA, it is dangerous; when it exceeds 20mA, it is life-threatening. Based on the above data, the average human body resistance is closest to ().