The connectors of general electronic products and the pins of electrical appliances are called plugs. Plugs and sockets of household AC power sources have male connectors protruding in the form of rods or copper plates, and female connector type power sockets with grooves or concave holes are physically inserted.
Size is an important technical requirement, which is related to whether plugs, sockets and converters can be used safely and meet the requirements of universal interchangeability to avoid wrong insertion.
The unqualified size will affect the user's use or cause hidden dangers such as poor contact and wrong insertion, damage the equipment and cause fire and electric shock accidents.
Internationally, household appliances are divided into three categories:
1, electrical appliances refer to electrical appliances with only one layer of insulation measures. This kind of electrical appliance must be equipped with leakage protector and grounding protection (that is, three-pin plug). Such as air conditioners, machine tools, motors, etc.
2, electrical appliances have double insulation measures, to add a leakage protector, you can not use grounding protection (that is, you can use two-pin plug). Such as TV, electric fan, desk lamp, induction cooker, ceramic electric stove, etc.
3. Electrical appliances are made in safe voltage, generally 12-36V, such as mobile phones and notebook computers.