What is a ground wire? The definition of a ground wire that everyone learns from textbooks is that a ground wire is an equipotential body that serves as a potential reference point for a circuit. This definition does not conform to the actual situation. The potential on an actual ground wire is not constant. If you use an instrument to measure the potential between points on the ground wire, you will find that the potentials of the points on the ground wire may differ greatly. It is these potential differences that cause abnormal operation of the circuit. The definition that a circuit is an equipotential body is only people\'s expectation of the potential of the ground wire. Henry gave a more realistic definition of the ground wire. He defined the ground wire as a low-impedance path for the signal to flow back to the source. This definition highlights the flow of current in the ground wire. According to this definition, it is easy to understand the cause of the potential difference in the ground wire. Because the impedance of the ground wire is never zero, when a current passes through a finite impedance, a voltage drop will be generated. Therefore, we should imagine the potential on the ground wire as waves in the sea, rising and falling.
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