The main difference between strong and weak electricity is the different uses. Strong electricity is used as a power source, weak electricity is used for information transfer. From 220/380V low-voltage circuits to 1000KV ultra-high-voltage power transmission belongs to the strong electricity, strong electricity is characterized by power transmission; while the scope covered by the weak electricity is much broader, such as communications, electronics, computers, radio and television, cell phones, medical equipment, a variety of household electronic appliances, etc., as well as all do not belong to the scope of the strong electricity internal electronic circuits contained in the various trades and industries of the apparatus, equipment, belong to the "weak electricity" we say. What we call "weak power", weak power is generally not to transfer and output power, but through electronic circuits to achieve a specific function or to complete a specific control.
And strong and weak power is not divided by voltage levels, such as 36V or less safe voltage lighting circuit still belongs to the category of strong power, but inside the 30KV high voltage television circuit still belongs to the field of weak power