The current intensity is in ampere, and the milliampere (mA) is11000 ampere. People's hands can feel 5 ~ 10 ma DC; You can also feel 1 ~ 10 mA and 60 Hz AC (sensing threshold). The maximum current that can make the arm muscles contract but still allow the hand to leave the power supply is called "discharge" current. The "release" current of direct current is about 75mA, and the "release" current of alternating current is 2 ~ 5~7mA for children, 5~7mA for women and 7 ~ 9 mA for men according to the size of arm muscles. Direct current usually causes strong muscle contraction, which often forces the victim to leave the power supply. 60 Hz alternating current makes the muscles of the electric shock area stiff, which often makes the victim unable to leave the power supply, thus prolonging the electric shock time and causing serious burns. Whether it is AC or DC, the higher the voltage and current intensity, the greater the damage.