Signal circuit and number of cable cores
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I accidentally posted it in the craft community. I’m new to this field and have encountered a rather confusing issue; I would appreciate everyone’s advice: why does an electrical signal need to form a circuit? Can’t the signal be sent using just one core? Or is there a common core that is connected to the negative pole uniformly? For example, in unbalanced transmission, a coaxial cable has only one core – isn’t that not enough to form a circuit? Also, the number of cores in the control cable is really a mystery; what information should one refer to in order to understand what determines that number of cores? Thank you!
If they are gathered at one location, can there be common lines? That’s how paperless recorders work