I. What is low voltage?

Low-voltage systems generally refer to DC circuits or audio and video lines, network cables, and telephone lines. The DC voltage typically does not exceed 32V. In household electrical appliances, devices such as telephones, computers, television sets (for cable TV signal input), and audio equipment (output lines) all fall under the category of low-voltage electrical equipment.

 

II. What is high voltage?

Strong electricity refers to the power-related aspects in the field of electrical engineering. It is characterized by high power, large current, and low frequency, with a primary focus on minimizing losses and maximizing efficiency. It is closely related to weak electricity and is the counterpart of "weak electricity."

 

III. What is the difference between the two?

The main difference between strong current and weak current lies in their different applications. Strong current is used as a source of power energy, while weak current is used for information transmission.

 

In terms of concept, strong current and weak current are generally easy to distinguish—mainly by their different applications. Strong current is used as a source of power energy, while weak current is used for information transmission. Household electrical systems are divided into strong-current and weak-current circuits. In power systems, voltages below 36V are referred to as safe voltages; voltages below 1kV are called low voltages, and voltages above 1kV are called high voltages. The lines that directly supply electricity to users are called distribution lines. For example, if the user’s voltage is 380/220V, such a line is referred to as a low-voltage distribution line—which is what is commonly known as "strong current" in home renovation projects.

Strong electricity and weak electricity are relative concepts. Conceptually, the primary distinction between them lies in their different applications; they cannot be simply defined by voltage levels alone. (If one insists on using voltage as the defining criterion, then voltages above 36V—considered the safe voltage for humans—could be classified as strong electricity, while voltages at or below 36V would be classified as weak electricity.) Although there is both overlap and distinction between the two, the general principle for differentiation is this: Strong electricity deals primarily with energy (electric power). It is characterized by high voltage, large current, high power, and low frequency. The main considerations in dealing with strong electricity focus on minimizing losses and improving efficiency. By contrast, weak electricity deals mainly with information—specifically, the transmission and control of information. It is characterized by low voltage, small current, low power, and high frequency. The primary considerations in weak electricity revolve around the effectiveness of information transmission, such as fidelity, speed, coverage, and reliability of the transmitted information.