Mr. House is not grounded three-prong outlet line

Yesterday , in order to solve the mystery , the reporter please Quanzhou modern high school physics teacher Mr. Guo went home field view .
After several tests to determine Guo laptop does " leakage ." When connecting the power , the voltage on the pen display "12 ~ 36V", palm obvious numbness ; pull the plug , use a battery -powered , hand no apparent sense of numerical test electric pen display "<12V".
After opening up the computer in contact with the socket , Guo identified leakage basic reasons : Mr. Fangling home is two decades old house , although the house using a three-prong outlet , but only picked up two lines, the first three jacks are not ground. "As a result , induction electric appliances produced , not routed through the ground floor , when palm contact , the current will lead to the body ." Guo said.
Whether the harm ? Depends on the electrical environment
Such people have a sense of whether the current micro- Ma harm the human body ?
Guo explained that the current generated by Su home laptop belonging induction , is not uncommon. "A lot of appliances at run-time , there will be a small amount of static electricity , but most are grounded wire circuit design , static electricity thus transferred to the ground, so people will not feel uncomfortable when you touch ." In addition, each person 's resistance sample sizes , sensitivity to electricity are not the same .
Guo said that human security is less than or equal to the current 36 volts, it is generally static negligible . But in a damp environment , if not ground electrical lines ( especially refrigerators, washing machines , etc. often run under wet conditions appliances ) , may be more dangerous. Encounter thunderstorms, people should try to avoid using these appliances is not grounding wire .