The voltage common terminal refers to the common terminal of the circuit. The male * * * terminal of the circuit is the connection point of a circuit set by itself for the convenience of analyzing the circuit. Generally, the negative pole of the power supply is set to the common point, which is also called "ground".
The male * * * terminal can be divided into the male * * * power terminal and the male * * * ground terminal, but the male * * * terminal usually refers to the ground terminal, because in AC signals, the power terminal and the ground are equivalent; How many volts is the voltage at a certain point (the formal name should be potential), which refers to the voltage of "ground" defined by a certain point to the male terminal.
Extended data:
The role of male terminal grounding
The main function of grounding is to prevent electric shock, damage to equipment and lines, fire and lightning, electrostatic damage and normal operation of power system.
Grounding is an electrical safety measure to ensure the normal work and personal safety of electrical equipment, which is realized by connecting metal wires with grounding devices. Common grounding methods include protective grounding, working grounding, lightning protection grounding, shielding grounding and anti-static grounding.
Grounding devices introduce leakage current, static charge and lightning current that may be generated on electrical equipment and other production equipment into the ground to avoid personal electric shock and possible accidents such as fire and explosion.
References:
Baidu encyclopedia-grounding gas