|转至：电工之家
P =UI,假设功率就是固定的1000W,当电压为100V,电流为10A时,和电压为10V,电流为100A时,哪个电会伤到人吗?
答：100V的电压为元凶，它具有给人体达到触电的电能量。并且人体与电源是一个并联关系，根据部分电路欧姆定律，通过该电阻的电压越大则电流越大。
人体触电的元凶是通过人体电阻的电流，电源电压根据欧姆定律I=U/R，人体电阻是一个动态变化的，当选择一个比较安全的电阻值时，如10V的电压无论怎样施加在人体上，最后计算出来的流过人体电阻的电流都非常小，不至于对人体形成威胁。如果说它的电流虽然大，但它仅仅只是一种输出功率的容量，就像大海里舀一瓢水一样，几乎显得微不足道。也就是说功率P与连接负载电阻的多少和它们最后的电流有关系。
虽然提问者知道电工学中的功率计算公式为P=I×U，但还有要知道触电的条件，需要知道人体的电阻在一般情况下为多少?多大的电流对人体危险?多大的电流可以致命?高频电流和低频电流哪一种对人较不危险?等这些答案就一清二楚了。
健康人的人体电阻,如果皮肤干燥又未受损伤,约达10KΩ至100KΩ，但在估计电压对人体的危害时,一般以1000Ω为标准。0.05~ 0.1A电流对人有危险，超过0.1A则可以致命。
一般认为电压在40V以下对人体无危险，这相当于0.04A电流通过1000Ω人体电阻的电压。电流对人体危害的程度随着电流频率的提高而下降,由于高频电的集肤作用,电流多从人体表皮通过,不易引起心脏麻痹,所以比低频电流来得安全。据报导,在通过50~60Hz电流时人体细胞组织极化最厉害，此频率电流对人体的危害最大。
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